Asp.net web application framework project.pdf

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ASP.NET - Introduction
ASP.NET is a web application framework developed and marketed by Microsoft to allow
programmers to build dynamic web sites.
It allows you to use a full featured programming language such as C# or VB.NET to build web
applications easily.
ASP.NET is a web development platform, which provides a programming model, acomprehensive
software infrastructure and various services required to build up robust web applications for PC,
as well as mobile devices.
ASP.NET works on top of the HTTP protocol, and uses the HTTP commands and policies to set
a browser-to-server bilateral communication and cooperation.
ASP.NET is a part of Microsoft .Net platform. ASP.NET applications are compiled codes, written
using the extensible and reusable components or objects present in .Net framework.These
codes can use the entire hierarchy of classes in .Net framework.
The ASP.NET application codes can be written in any of the following languages:
 C#
 Visual Basic.Net
 Jscript
 J#
ASP.NET is used to produce interactive, data-driven web applications over the internet. It consists
of a large number of controls such as text boxes, buttons, and labels for assembling, configuring,
and manipulating code to create HTML pages.
ASP.NET Web Forms Model
ASP.NET web forms extend the event-driven model of interaction to the web applications. The
browser submits a web form to the web server and the server returns a full markup page or HTML
page in response.
All client side user activities are forwarded to the server for stateful processing. The server
processes the output of the client actions and triggers the reactions.
Now, HTTP is a stateless protocol. ASP.NET framework helps in storing the information
regarding the state of the application, which consists of:
Page state
Session state
The page state is the state of the client, i.e., the content of various input fields in the web form.
The session state is the collective information obtained from various pages the user visited and
worked with, i.e., the overall session state. To clear the concept, let us take an example of a
shopping cart.

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User adds items to a shopping cart. Items are selected from a page, say the items page, and the
total collected items and price are shown on a different page, say the cart page. Only HTTP cannot
keep track of all the information coming from various pages. ASP.NET session state and server
side infrastructure keeps track of the information collected globally over a session.
The ASP.NET runtime carries the page state to and from the server across page requests while
generating ASP.NET runtime codes, and incorporates the state of the server side components in
hidden fields.
This way, the server becomes aware of the overall application state and operates in a two-tiered
connected way.
The ASP.NET Component Model
The ASP.NET component model provides various building blocks of ASP.NET pages. Basically
it is an object model, which describes:
Server side counterparts of almost all HTML elements or tags, such as <form> and <input>.
Server controls, which help in developing complex user-interface. For example, the Calendar
control or the Gridview control.
ASP.NET is a technology, which works on the .Net framework that contains all web-related
functionalities. The .Net framework is made of an object-oriented hierarchy. An ASP.NET web
application is made of pages. When a user requests an ASP.NET page, the IIS delegates the
processing of the page to the ASP.NET runtime system.
The ASP.NET runtime transforms the .aspx page into an instance of a class, which inherits from
the base class page of the .Net framework. Therefore, each ASP.NET page is an object and all its
components i.e., the server-side controls are also objects.
Components of .Net Framework
The following table describes the components of the .Net framework and the job they perform:
Components and their Description
(1) Common Language Runtime or CLR
It performs memory management, exception handling, debugging, security checking, thread
execution, code execution, code safety, verification, and compilation. The code that is directly
managed by the CLR is called the managed code. When the managed code is compiled, the
compiler converts the source code into a CPU independent intermediate language (IL) code. A
Just In Time(JIT) compiler compiles the IL code into native code, which is CPU specific.
(2) .Net Framework Class Library
It contains a huge library of reusable types. classes, interfaces, structures, and enumerated values,
which are collectively called types.
(3) Common Language Specification
It contains the specifications for the .Net supported languages and implementation of language
integration.

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(4) Common Type System
It provides guidelines for declaring, using, and managing types at runtime, and cross-language
communication.
(5) Metadata and Assemblies
Metadata is the binary information describing the program, which is either stored in a portable
executable file (PE) or in the memory. Assembly is a logical unit consisting of the assembly
manifest, type metadata, IL code, and a set of resources like image files.
(6) Windows Forms
Windows Forms contain the graphical representation of any window displayed in the application.
(7) ASP.NET and ASP.NET AJAX
ASP.NET is the web development model and AJAX is an extension of ASP.NET for developing
and implementing AJAX functionality. ASP.NET AJAX contains the components that allow the
developer to update data on a website without a complete reload of the page.
(8) ADO.NET
It is the technology used for working with data and databases. It provides access to data sources
like SQL server, OLE DB, XML etc. The ADO.NET allows connection to data sources for
retrieving, manipulating, and updating data.
(9) Windows Workflow Foundation (WF)
It helps in building workflow-based applications in Windows. It contains activities, workflow
runtime, workflow designer, and a rules engine.
(10) Windows Presentation Foundation
It provides a separation between the user interface and the business logic. It helps in developing
visually stunning interfaces using documents, media, two and three dimensional graphics,
animations, and more.
(11) Windows Communication Foundation (WCF)
It is the technology used for building and executing connected systems.
(12) Windows CardSpace
It provides safety for accessing resources and sharing personal information on the internet.
(13) LINQ
It imparts data querying capabilities to .Net languages using a syntax which is similar to the
tradition query language SQL.

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ASP.NET - Environment Setup
ASP.NET provides an abstraction layer on top of HTTP on which the web applications are built.
It provides high-level entities such as classes and components within an object-oriented paradigm.
The key development tool for building ASP.NET applications and front ends is Visual Studio.
Visual Studio is an integrated development environment for writing, compiling, and debugging
the code. It provides a complete set of development tools for building ASP.NET web applications,
web services, desktop applications, and mobile applications.
Installation
Microsoft provides a free version of visual studio which also contains SQL Server and it can be
downloaded from www.visualstudio.com.
Step 1 − Once downloading is complete, run the installer. The following dialog will be displayed.
Visual Studio Installer
Step 2 − Click on the Install button and it will start the installation process.
Installation Process
Step 3 − Once the installation process is completed successfully, you will see the following dialog.
Close this dialog and restart your computer if required.
Setup Completed
Step 4 − Open Visual Studio from start Menu which will open the following dialog. It will be a
while for the first time for preparation.
Visual Studio
Step 5 − Once all is done you will see the main window of Visual studio.
Main Window
Let’s create a new project from File → New → Project
New Project
The Visual Studio IDE
The new project window allows choosing an application template from the available templates.

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Visual Studio IDE
When you start a new web site, ASP.NET provides the starting folders and files for the site,
including two files for the first web form of the site.
The file named Default.aspx contains the HTML and asp code that defines the form, and the file
named Default.aspx.cs (for C# coding) or the file named Default.aspx.vb (for VB coding) contains
the code in the language you have chosen and this code is responsible for the actions performed
on a form.
The primary window in the Visual Studio IDE is the Web Forms Designer window. Other
supporting windows are the Toolbox, the Solution Explorer, and the Properties window. You use
the designer to design a web form, to add code to the control on the form so that the form works
according to your need, you use the code editor.
Working with Views and Windows
You can work with windows in the following ways:
To change the Web Forms Designer from one view to another, click on the Design or source
button.
To close a window, click on the close button on the upper right corner and to redisplay, select it
from the View menu.
To hide a window, click on its Auto Hide button. The window then changes into a tab. To display
again, click the Auto Hide button again.
To change the size of a window, just drag it.
Adding Folders and Files to your Website
When a new web form is created, Visual Studio automatically generates the starting HTML for
the form and displays it in Source view of the web forms designer. The Solution Explorer is used
to add any other files, folders or any existing item on the web site.
To add a standard folder, right-click on the project or folder under which you are going to add the
folder in the Solution Explorer and choose New Folder.
To add an ASP.NET folder, right-click on the project in the Solution Explorer and select the folder
from the list.
To add an existing item to the site, right-click on the project or folder under which you are going
to add the item in the Solution Explorer and select from the dialog box.
Projects and Solutions

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A typical ASP.NET application consists of many items: the web content files (.aspx), source files
(.cs files), assemblies (.dll and .exe files), data source files (.mdb files), references, icons, user
controls and miscellaneous other files and folders. All these files that make up the website are
contained in a Solution.
When a new website is created. VB2008 automatically creates the solution and displays it in the
solution explorer.
Solutions may contain one or more projects. A project contains content files, source files, and
other files like data sources and image files. Generally, the contents of a project are compiled
into an assembly as an executable file (.exe) or a dynamic link library (.dll) file.
Typically a project contains the following content files:
 Page file (.aspx)
 User control (.ascx)
 Web service (.asmx)
 Master page (.master)
 Site map (.sitemap)
 Website configuration file (.config)
Building and Running a Project
You can execute an application by:
Selecting Start
Selecting Start Without Debugging from the Debug menu,
pressing F5
Ctrl-F5
The program is built meaning, the .exe or the .dll files are generated by selecting a command from
the Build menu.

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ASP.NET - Life Cycle
ASP.NET life cycle specifies, how:
 ASP.NET processes pages to produce dynamic output
 The application and its pages are instantiated and processed
 ASP.NET compiles the pages dynamically
The ASP.NET life cycle could be divided into two groups:
 Application Life Cycle
 Page Life Cycle
ASP.NET Application Life Cycle
The application life cycle has the following stages:
 User makes a request for accessing application resource, a page. Browser sends this request
to the web server.
 A unified pipeline receives the first request and the following events take place:
o An object of the class ApplicationManager is created.
o An object of the class HostingEnvironment is created to provide information
regarding the resources.
o Top level items in the application are compiled.
 Response objects are created. The application objects such as HttpContext, HttpRequest
and HttpResponse are created and initialized.
 An instance of the HttpApplication object is created and assigned to the request.
 The request is processed by the HttpApplication class. Different events are raised by this
class for processing the request.
ASP.NET Page Life Cycle
When a page is requested, it is loaded into the server memory, processed, and sent to the
browser. Then it is unloaded from the memory. At each of these steps, methods and events are
available, which could be overridden according to the need of the application. In other words,
you can write your own code to override the default code.

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The Page class creates a hierarchical tree of all the controls on the page. All the components on
the page, except the directives, are part of this control tree. You can see the control tree by
adding trace= "true" to the page directive. We will cover page directives and tracing under
'directives' and 'event handling'.
The page life cycle phases are:
 Initialization
 Instantiation of the controls on the page
 Restoration and maintenance of the state
 Execution of the event handler codes
 Page rendering
Understanding the page cycle helps in writing codes for making some specific thing happen at any
stage of the page life cycle. It also helps in writing custom controls and initializing them at right
time, populate their properties with view-state data and run control behavior code.
Following are the different stages of an ASP.NET page:
 Page request - When ASP.NET gets a page request, it decides whether to parse and compile
the page, or there would be a cached version of the page; accordingly the response is sent.
 Starting of page life cycle - At this stage, the Request and Response objects are set. If the
request is an old request or post back, the IsPostBack property of the page is set to true. The
UICulture property of the page is also set.
 Page initialization - At this stage, the controls on the page are assigned unique ID by setting
the UniqueID property and the themes are applied. For a new request, postback data is loaded
and the control properties are restored to the view-state values.
 Page load - At this stage, control properties are set using the view state and control state
values.
 Validation - Validate method of the validation control is called and on its successful
execution, the IsValid property of the page is set to true.
 Postback event handling - If the request is a postback (old request), the related event handler
is invoked.

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 Page rendering - At this stage, view state for the page and all controls are saved. The page
calls the Render method for each control and the output of rendering is written to the
OutputStream class of the Response property of page.
 Unload - The rendered page is sent to the client and page properties, such as Response and
Request, are unloaded and all cleanup done.
ASP.NET Page Life Cycle Events
At each stage of the page life cycle, the page raises some events, which could be coded. An event
handler is basically a function or subroutine, bound to the event, using declarative attributes such
as Onclick or handle.
Following are the page life cycle events:
 PreInit - PreInit is the first event in page life cycle. It checks the IsPostBack property and
determines whether the page is a postback. It sets the themes and master pages, creates
dynamic controls, and gets and sets profile property values. This event can be handled by
overloading the OnPreInit method or creating a Page_PreInit handler.
 Init - Init event initializes the control property and the control tree is built. This event can be
handled by overloading the OnInit method or creating a Page_Init handler.
 InitComplete - InitComplete event allows tracking of view state. All the controls turn on
view-state tracking.
 LoadViewState - LoadViewState event allows loading view state information into the
controls.
 LoadPostData - During this phase, the contents of all the input fields are defined with the
<form> tag are processed.
 PreLoad - PreLoad occurs before the post back data is loaded in the controls. This event can
be handled by overloading the OnPreLoad method or creating a Page_PreLoad handler.
 Load - The Load event is raised for the page first and then recursively for all child controls.
The controls in the control tree are created. This event can be handled by overloading the
OnLoad method or creating a Page_Load handler.
 LoadComplete - The loading process is completed, control event handlers are run, and page
validation takes place. This event can be handled by overloading the OnLoadComplete
method or creating a Page_LoadComplete handler

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 PreRender - The PreRender event occurs just before the output is rendered. By handling this
event, pages and controls can perform any updates before the output is rendered.
 PreRenderComplete - As the PreRender event is recursively fired for all child controls, this
event ensures the completion of the pre-rendering phase.
 SaveStateComplete - State of control on the page is saved. Personalization, control state and
view state information is saved. The HTML markup is generated. This stage can be handled
by overriding the Render method or creating a Page_Render handler.
 UnLoad - The UnLoad phase is the last phase of the page life cycle. It raises the UnLoad
event for all controls recursively and lastly for the page itself. Final cleanup is done and all
resources and references, such as database connections, are freed. This event can be handled
by modifying the OnUnLoad method or creating a Page_UnLoad handler.

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ASP.NET - First Example
An ASP.NET page is made up of a number of server controls along with HTML controls, text,
and images. Sensitive data from the page and the states of different controls on the page are stored
in hidden fields that form the context of that page request.
ASP.NET runtime controls the association between a page instance and its state. An ASP.NET
page is an object of the Page or inherited from it.
All the controls on the pages are also objects of the related control class inherited from a parent
Control class. When a page is run, an instance of the object page is created along with all its content
controls.
An ASP.NET page is also a server side file saved with the .aspx extension. It is modular in
nature and can be divided into the following core sections:
 Page Directives
 Code Section
 Page Layout
Page Directives
The page directives set up the environment for the page to run. The @Page directive defines page-
specific attributes used by ASP.NET page parser and compiler. Page directives specify howthe
page should be processed, and which assumptions need to be taken about the page.
It allows importing namespaces, loading assemblies, and registering new controls with custom tag
names and namespace prefixes.
Code Section
The code section provides the handlers for the page and control events along with other functions
required. We mentioned that, ASP.NET follows an object model. Now, these objects raise events
when some events take place on the user interface, like a user clicks a button or moves the
cursor. The kind of response these events need to reciprocate is coded in the event handler
functions. The event handlers are nothing but functions bound to the controls.
The code section or the code behind file provides all these event handler routines, and other
functions used by the developer. The page code could be precompiled and deployed in the form
of a binary assembly.
Page Layout
The page layout provides the interface of the page. It contains the server controls, text, inline
JavaScript, and HTML tags.
The following code snippet provides a sample ASP.NET page explaining Page directives, code
section and page layout written in C#:

<% @Page Language="C#" %>

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Copy this file to the web server root directory. Generally it is c:iNETputwwwroot. Open the file
from the browser to execute it and it generates following result:
Using Visual Studio IDE
Let us develop the same example using Visual Studio IDE. Instead of typing the code, you can
just drag the controls into the design view:

<script runat="server">
private void convertoupper(object sender, EventArgs e)
{
string str = mytext.Value;
changed_text.InnerHtml = str.ToUpper();
}
</script>

<html>
<head>
<title> Change to Upper Case </title>
</head>
<body>
<h3> Conversion to Upper Case </h3>
<form runat="server">
<input runat="server" id="mytext" type="text" />
<input runat="server" id="button1" type="submit" value="Enter..."
OnServerClick="convertoupper"/>
<hr />
<h3> Results: </h3>
<span runat="server" id="changed_text" />
</form>
</body>
</html>

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The content file is automatically developed. All you need to add is the Button1_Click routine,
which is as follows:
The content file code is as given:
protected void Button1_Click(object sender, EventArgs e)
{
string buf = TextBox1.Text;
changed_text.InnerHtml = buf.ToUpper();
}
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs"
Inherits="firstexample._Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>
Untitled Page
</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server" style="width:224px">
</asp:TextBox>
<br />
<br />
<asp:Button ID="Button1" runat="server" Text="Enter..." style="width:85px"
onclick="Button1_Click" />
<hr />

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Execute the example by right clicking on the design view and choosing 'View in Browser' from
the popup menu. This generates the following result:
ASP.NET - Event Handling
An event is an action or occurrence such as a mouse click, a key press, mouse movements, or
any system-generated notification. A process communicates through events. For example,
interrupts are system-generated events. When events occur, the application should be able to
respond to it and manage it.
<h3> Results: </h3>
<span runat="server" id="changed_text" />
</div>
</form>
</body>
</html>

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Events in ASP.NET raised at the client machine, and handled at the server machine. Forexample,
a user clicks a button displayed in the browser. A Click event is raised. The browser handles this
client-side event by posting it to the server.
The server has a subroutine describing what to do when the event is raised; it is called the event-
handler. Therefore, when the event message is transmitted to the server, it checks whether the
Click event has an associated event handler. If it has, the event handler is executed.
Event Arguments
ASP.NET event handlers generally take two parameters and return void. The first parameter
represents the object raising the event and the second parameter is event argument.
The general syntax of an event is:
Application and Session Events
The most important application events are:
 Application_Start - It is raised when the application/website is started.
 Application_End - It is raised when the application/website is stopped.
Similarly, the most used Session events are:
 Session_Start - It is raised when a user first requests a page from the application.
 Session_End - It is raised when the session ends.
Page and Control Events
Common page and control events are:
 DataBinding - It is raised when a control binds to a data source.
 Disposed - It is raised when the page or the control is released.
 Error - It is a page event, occurs when an unhandled exception is thrown.
 Init - It is raised when the page or the control is initialized.
 Load - It is raised when the page or a control is loaded.
 PreRender - It is raised when the page or the control is to be rendered.
 Unload - It is raised when the page or control is unloaded from memory.
Event Handling Using Controls
All ASP.NET controls are implemented as classes, and they have events which are fired when a
user performs a certain action on them. For example, when a user clicks a button the 'Click' event
is generated. For handling events, there are in-built attributes and event handlers. Event handler
is coded to respond to an event, and take appropriate action on it.
By default, Visual Studio creates an event handler by including a Handles clause on the Sub
procedure. This clause names the control and event that the procedure handles.
The ASP tag for a button control:
private void EventName (object sender, EventArgs e);

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The event handler for the Click event:
An event can also be coded without Handles clause. Then, the handler must be named according
to the appropriate event attribute of the control.
The ASP tag for a button control:
The event handler for the Click event:
The common control events are:
Event Attribute Controls
Click OnClick Button, image button, link button, image
map
Command OnCommand Button, image button, link button
TextChanged OnTextChanged Text box
SelectedIndexChanged OnSelectedIndexChanged Drop-down list, list box, radio button
list, check box list.
CheckedChanged OnCheckedChanged Check box, radio button
Some events cause the form to be posted back to the server immediately, these are called the
postback events. For example, the click event such as, Button.Click.
Some events are not posted back to the server immediately, these are called non-postback events.
<asp:Button ID="btnCancel" runat="server" Text="Cancel" />
Protected Sub btnCancel_Click(ByVal sender As Object, ByVal e As System.EventArgs)
Handles btnCancel.Click
End Sub
<asp:Button ID="btnCancel" runat="server" Text="Cancel" Onclick="btnCancel_Click" />
Protected Sub btnCancel_Click(ByVal sender As Object, ByVal e As System.EventArgs)
End Sub

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For example, the change events or selection events such as TextBox.TextChanged or
CheckBox.CheckedChanged. The nonpostback events could be made to post back immediately by
setting their AutoPostBack property to true.
Default Events
The default event for the Page object is Load event. Similarly, every control has a default event.
For example, default event for the button control is the Click event.
The default event handler could be created in Visual Studio, just by double clicking the control
in design view. The following table shows some of the default events for common controls:
Control Default Event
AdRotator AdCreated
BulletedList Click
Button Click
Calender SelectionChanged
CheckBox CheckedChanged
CheckBoxList SelectedIndexChanged
DataGrid SelectedIndexChanged
DataList SelectedIndexChanged
DropDownList SelectedIndexChanged
HyperLink Click
ImageButton Click
ImageMap Click

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LinkButton Click
ListBox SelectedIndexChanged
Menu MenuItemClick
RadioButton CheckedChanged
RadioButtonList SelectedIndexChanged
Example
This example includes a simple page with a label control and a button control on it. As the page
events such as Page_Load, Page_Init, Page_PreRender etc. take place, it sends a message, which
is displayed by the label control. When the button is clicked, the Button_Click event is raised and
that also sends a message to be displayed on the label.
Create a new website and drag a label control and a button control on it from the control tool
box. Using the properties window, set the IDs of the controls as .lblmessage. and .btnclick.
respectively. Set the Text property of the Button control as 'Click'.
The markup file (.aspx):
Inherits="eventdemo._Default" %>
<title>Untitled Page</title>
</head>
<body>
<div>
<asp:Label ID="lblmessage" runat="server" >
</asp:Label>
<br />
<br />

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Double click on the design view to move to the code behind file. The Page_Load event is
automatically created without any code in it. Write down the following self-explanatory code lines:
<br />
<asp:Button ID="btnclick" runat="server" Text="Click" onclick="btnclick_Click" />
</div>
</form>
</body>
</html>
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
namespace eventdemo {
public partial class _Default : System.Web.UI.Page {
protected void Page_Load(object sender, EventArgs e) {
lblmessage.Text += "Page load event handled. <br />";
if (Page.IsPostBack) {
lblmessage.Text += "Page post back event handled.<br/>";
}
}
protected void Page_Init(object sender, EventArgs e) {
lblmessage.Text += "Page initialization event handled.<br/>";
}
protected void Page_PreRender(object sender, EventArgs e) {
lblmessage.Text += "Page prerender event handled. <br/>";
}

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Execute the page. The label shows page load, page initialization and, the page pre-render events.
Click the button to see effect:
ASP.NET - Server Side
We have studied the page life cycle and how a page contains various controls. The page itself is
instantiated as a control object. All web forms are basically instances of the ASP.NET Page
class. The page class has the following extremely useful properties that correspond to intrinsic
objects:
 Session
 Application
 Cache
protected void btnclick_Click(object sender, EventArgs e) {
lblmessage.Text += "Button click event handled. <br/>";
}
}
}

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 Request
 Response
 Server
 User
 Trace
We will discuss each of these objects in due time. In this tutorial we will explore the Server
object, the Request object, and the Response object.
Server Object
The Server object in Asp.NET is an instance of the System.Web.HttpServerUtility class. The
HttpServerUtility class provides numerous properties and methods to perform various jobs.
Properties and Methods of the Server object
The methods and properties of the HttpServerUtility class are exposed through the intrinsic
Server object provided by ASP.NET.
The following table provides a list of the properties:
Property Description
MachineName Name of server computer
ScriptTimeOut Gets and sets the request time-out value in seconds.
The following table provides a list of some important methods:
Method Description
CreateObject(String) Creates an instance of the COM object identified by
its ProgID (Programmatic ID).
CreateObject(Type) Creates an instance of the COM object identified by
its Type.
Equals(Object) Determines whether the specified Object is equal to
the current Object.
Execute(String) Executes the handler for the specified virtual path in

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the context of the current request.
Execute(String, Boolean) Executes the handler for the specified virtual path in
the context of the current request and specifies
whether to clear the QueryString and Form
collections.
GetLastError Returns the previous exception.
GetType Gets the Type of the current instance.
HtmlEncode Changes an ordinary string into a string with legal
HTML characters.
HtmlDecode Converts an Html string into an ordinary string.
ToString Returns a String that represents the current Object.
Transfer(String) For the current request, terminates execution of the
current page and starts execution of a new page by
using the specified URL path of the page.
UrlDecode Converts an URL string into an ordinary string.
UrlEncodeToken Works same as UrlEncode, but on a byte array that
contains Base64-encoded data.
UrlDecodeToken Works same as UrlDecode, but on a byte array that
contains Base64-encoded data.
MapPath Return the physical path that corresponds to a
specified virtual file path on the server.
Transfer Transfers execution to another web page in the

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current application.
Request Object
The request object is an instance of the System.Web.HttpRequest class. It represents the values
and properties of the HTTP request that makes the page loading into the browser.
The information presented by this object is wrapped by the higher level abstractions (the web
control model). However, this object helps in checking some information such as the client
browser and cookies.
Properties and Methods of the Request Object
The following table provides some noteworthy properties of the Request object:
AcceptTypes Gets a string array of client-supported MIME
accept types.
ApplicationPath Gets the ASP.NET application's virtual application
root path on the server.
Browser Gets or sets information about the requesting
client's browser capabilities.
ContentEncoding Gets or sets the character set of the entity-body.
ContentLength Specifies the length, in bytes, of content sent by the
client.
ContentType Gets or sets the MIME content type of the
incoming request.
Cookies Gets a collection of cookies sent by the client.
FilePath Gets the virtual path of the current request.

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Files Gets the collection of files uploaded by the client,
in multipart MIME format.
Form Gets a collection of form variables.
Headers Gets a collection of HTTP headers.
HttpMethod Gets the HTTP data transfer method (such as GET,
POST, or HEAD) used by the client.
InputStream Gets the contents of the incoming HTTP entity
body.
IsSecureConnection Gets a value indicating whether the HTTP
connection uses secure sockets (that is, HTTPS).
QueryString Gets the collection of HTTP query string variables.
RawUrl Gets the raw URL of the current request.
RequestType Gets or sets the HTTP data transfer method (GET
or POST) used by the client.
ServerVariables Gets a collection of Web server variables.
TotalBytes Gets the number of bytes in the current input
stream.
Url Gets information about the URL of the current
request.
UrlReferrer Gets information about the URL of the client's
previous request that is linked to the current URL.

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UserAgent Gets the raw user agent string of the client browser.
UserHostAddress Gets the IP host address of the remote client.
UserHostName Gets the DNS name of the remote client.
UserLanguages Gets a sorted string array of client language
preferences.
Method Description
BinaryRead Performs a binary read of a specified number of
bytes from the current input stream.
Equals(Object) Determines whether the specified object is equal to
the current object. (Inherited from object.)
MapImageCoordinates Maps an incoming image-field form parameter to
appropriate x-coordinate and y-coordinate values.
MapPath(String) Maps the specified virtual path to a physical path.
SaveAs Saves an HTTP request to disk.
ToString Returns a String that represents the current object.
ValidateInput Causes validation to occur for the collections
accessed through the Cookies, Form, and
QueryString properties.

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Response Object
The Response object represents the server's response to the client request. It is an instance of the
System.Web.HttpResponse class.
In ASP.NET, the response object does not play any vital role in sending HTML text to the client,
because the server-side controls have nested, object oriented methods for rendering themselves.
However, the HttpResponse object still provides some important functionalities, like the cookie
feature and the Redirect() method. The Response.Redirect() method allows transferring the user
to another page, inside as well as outside the application. It requires a round trip.
Properties and Methods of the Response Object
The following table provides some noteworthy properties of the Response object:
Buffer Gets or sets a value indicating whether to buffer the
output and send it after the complete response is
finished processing.
BufferOutput Gets or sets a value indicating whether to buffer the
output and send it after the complete page is
finished processing.
Charset Gets or sets the HTTP character set of the output
stream.
ContentEncoding Gets or sets the HTTP character set of the output
stream.
ContentType Gets or sets the HTTP MIME type of the output
stream.
Cookies Gets the response cookie collection.
Expires Gets or sets the number of minutes before a page
cached on a browser expires.
ExpiresAbsolute Gets or sets the absolute date and time at which to

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remove cached information from the cache.
HeaderEncoding Gets or sets an encoding object that represents the
encoding for the current header output stream.
Headers Gets the collection of response headers.
IsClientConnected Gets a value indicating whether the client is still
connected to the server.
Output Enables output of text to the outgoing HTTP
response stream.
OutputStream Enables binary output to the outgoing HTTP
content body.
RedirectLocation Gets or sets the value of the Http Location header.
Status Sets the status line that is returned to the client.
StatusCode Gets or sets the HTTP status code of the output
returned to the client.
StatusDescription Gets or sets the HTTP status string of the output
returned to the client.
SubStatusCode Gets or sets a value qualifying the status code of
the response.
SuppressContent Gets or sets a value indicating whether to send
HTTP content to the client.
Method Description

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AddHeader Adds an HTTP header to the output stream.
AddHeader is provided for compatibility with
earlier versions of ASP.
AppendCookie Infrastructure adds an HTTP cookie to the intrinsic
cookie collection.
AppendHeader Adds an HTTP header to the output stream.
AppendToLog Adds custom log information to the InterNET
Information Services (IIS) log file.
BinaryWrite Writes a string of binary characters to the HTTP
output stream.
ClearContent Clears all content output from the buffer stream.
Close Closes the socket connection to a client.
End Sends all currently buffered output to the client,
stops execution of the page, and raises the
EndRequest event.
Equals(Object) Determines whether the specified object is equal to
the current object.
Flush Sends all currently buffered output to the client.
Pics Appends a HTTP PICS-Label header to the output
stream.

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Redirect(String) Redirects a request to a new URL and specifies the
new URL.
Redirect(String, Boolean) Redirects a client to a new URL. Specifies the new
URL and whether execution of the current page
should terminate.
SetCookie Updates an existing cookie in the cookie collection.
ToString Returns a String that represents the current Object.
TransmitFile(String) Writes the specified file directly to an HTTP
response output stream, without buffering it in
memory.
Write(Char) Writes a character to an HTTP response output
stream.
Write(Object) Writes an object to an HTTP response stream.
Write(String) Writes a string to an HTTP response output stream.
WriteFile(String) Writes the contents of the specified file directly to
an HTTP response output stream as a file block.
WriteFile(String, Boolean) Writes the contents of the specified file directly to
an HTTP response output stream as a memory
block.
Example
The following simple example has a text box control where the user can enter name, a button to
send the information to the server, and a label control to display the URL of the client computer.
The content file:

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The code behind Button1_Click:
Run the page to see the following result:
Inherits="server_side._Default" %>
</head>
<body>
<div>
Enter your name:
<br />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Submit" />
<br />
<asp:Label ID="Label1" runat="server"/>
</div>
</form>
</body>
</html>
protected void Button1_Click(object sender, EventArgs e) {
if (!String.IsNullOrEmpty(TextBox1.Text)) {
// Access the HttpServerUtility methods through
// the intrinsic Server object.
Label1.Text = "Welcome, " + Server.HtmlEncode(TextBox1.Text) + ". <br/> The url is " +
Server.UrlEncode(Request.Url.ToString())
}
}

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ASP.NET - Server Controls
Controls are small building blocks of the graphical user interface, which include text boxes,
buttons, check boxes, list boxes, labels, and numerous other tools. Using these tools, the users
can enter data, make selections and indicate their preferences.
Controls are also used for structural jobs, like validation, data access, security, creating master

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pages, and data manipulation.

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ASP.NET uses five types of web controls, which are:
 HTML controls
 HTML Server controls
 ASP.NET Server controls
 ASP.NET Ajax Server controls
 User controls and custom controls
ASP.NET server controls are the primary controls used in ASP.NET. These controls can be
grouped into the following categories:
 Validation controls - These are used to validate user input and they work by running
client-side script.
 Data source controls - These controls provides data binding to different data sources.
 Data view controls - These are various lists and tables, which can bind to data from data
sources for displaying.
 Personalization controls - These are used for personalization of a page according to the
user preferences, based on user information.
 Login and security controls - These controls provide user authentication.
 Master pages - These controls provide consistent layout and interface throughout the
application.
 Navigation controls - These controls help in navigation. For example, menus, tree view
etc.
 Rich controls - These controls implement special features. For example, AdRotator,
FileUpload, and Calendar control.
The syntax for using server controls is:
In addition, visual studio has the following features, to help produce in error-free coding:
 Dragging and dropping of controls in design view
 IntelliSense feature that displays and auto-completes the properties
 The properties window to set the property values directly
Properties of the Server Controls
ASP.NET server controls with a visual aspect are derived from the WebControl class and inherit
all the properties, events, and methods of this class.
The WebControl class itself and some other server controls that are not visually rendered are
derived from the System.Web.UI.Control class. For example, PlaceHolder control or XML
control.
ASP.Net server controls inherit all properties, events, and methods of the WebControl and
System.Web.UI.Control class.
The following table shows the inherited properties, common to all server controls:
<asp:controlType ID ="ControlID" runat="server" Property1=value1 [Property2=value2] />

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AccessKey Pressing this key with the Alt key moves focus to the
control.
Attributes It is the collection of arbitrary attributes (for rendering only)
that do not correspond to properties on the control.
BackColor Background color.
BindingContainer The control that contains this control's data binding.
BorderColor Border color.
BorderStyle Border style.
BorderWidth Border width.
CausesValidation Indicates if it causes validation.
ChildControlCreated It indicates whether the server control's child controls have
been created.
ClientID Control ID for HTML markup.
Context The HttpContext object associated with the server control.
Controls Collection of all controls contained within the control.
ControlStyle The style of the Web server control.
CssClass CSS class

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DataItemContainer Gets a reference to the naming container if the naming
container implements IDataItemContainer.
DataKeysContainer Gets a reference to the naming container if the naming
container implements IDataKeysControl.
DesignMode It indicates whether the control is being used on a design
surface.
DisabledCssClass Gets or sets the CSS class to apply to the rendered HTML
element when the control is disabled.
Enabled Indicates whether the control is grayed out.
EnableTheming Indicates whether theming applies to the control.
EnableViewState Indicates whether the view state of the control is
maintained.
Events Gets a list of event handler delegates for the control.
Font Font.
Forecolor Foreground color.
HasAttributes Indicates whether the control has attributes set.
HasChildViewState Indicates whether the current server control's child controls
have any saved view-state settings.
Height Height in pixels or %.
ID Identifier for the control.

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IsChildControlStateCleared Indicates whether controls contained within this control
have control state.
IsEnabled Gets a value indicating whether the control is enabled.
IsTrackingViewState It indicates whether the server control is saving changes to
its view state.
IsViewStateEnabled It indicates whether view state is enabled for this control.
LoadViewStateById It indicates whether the control participates in loading its
view state by ID instead of index.
Page Page containing the control.
Parent Parent control.
RenderingCompatibility It specifies the ASP.NET version that the rendered HTML
will be compatible with.
Site The container that hosts the current control when rendered
on a design surface.
SkinID Gets or sets the skin to apply to the control.
Style Gets a collection of text attributes that will be rendered as a
style attribute on the outer tag of the Web server control.
TabIndex Gets or sets the tab index of the Web server control.
TagKey Gets the HtmlTextWriterTag value that corresponds to this
Web server control.
TagName Gets the name of the control tag.

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TemplateControl The template that contains this control.
TemplateSourceDirectory Gets the virtual directory of the page or control containing
this control.
ToolTip Gets or sets the text displayed when the mouse pointer
hovers over the web server control.
UniqueID Unique identifier.
ViewState Gets a dictionary of state information that saves and restores
the view state of a server control across multiple requests
for the same page.
ViewStateIgnoreCase It indicates whether the StateBag object is case-insensitive.
ViewStateMode Gets or sets the view-state mode of this control.
Visible It indicates whether a server control is visible.
Width Gets or sets the width of the Web server control.
Methods of the Server Controls
The following table provides the methods of the server controls:
Method Description
AddAttributesToRender Adds HTML attributes and styles that need to be rendered
to the specified HtmlTextWriterTag.
AddedControl Called after a child control is added to the Controls

38 | P a g e
collection of the control object.
AddParsedSubObject Notifies the server control that an element, either XML or
HTML, was parsed, and adds the element to the server
control's control collection.
ApplyStyleSheetSkin Applies the style properties defined in the page style sheet
to the control.
ClearCachedClientID Infrastructure. Sets the cached ClientID value to null.
ClearChildControlState Deletes the control-state information for the server
control's child controls.
ClearChildState Deletes the view-state and control-state information for all
the server control's child controls.
ClearChildViewState Deletes the view-state information for all the server
control's child controls.
CreateChildControls Used in creating child controls.
CreateControlCollection Creates a new ControlCollection object to hold the child
controls.
CreateControlStyle Creates the style object that is used to implement all style
related properties.
DataBind Binds a data source to the server control and all its child
controls.
DataBind(Boolean) Binds a data source to the server control and all its child
controls with an option to raise the DataBinding event.
DataBindChildren Binds a data source to the server control's child controls.

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Dispose Enables a server control to perform final clean up before it
is released from memory.
EnsureChildControls Determines whether the server control contains child
controls. If it does not, it creates child controls.
EnsureID Creates an identifier for controls that do not have an
identifier.
Equals(Object) Determines whether the specified object is equal to the
current object.
Finalize Allows an object to attempt to free resources and perform
other cleanup operations before the object is reclaimed by
garbage collection.
FindControl(String) Searches the current naming container for a server control
with the specified id parameter.
FindControl(String, Int32) Searches the current naming container for a server control
with the specified id and an integer.
Focus Sets input focus to a control.
GetDesignModeState Gets design-time data for a control.
GetType Gets the type of the current instance.
GetUniqueIDRelativeTo Returns the prefixed portion of the UniqueID property of
the specified control.
HasControls Determines if the server control contains any child

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controls.
HasEvents Indicates whether events are registered for the control or
any child controls.
IsLiteralContent Determines if the server control holds only literal content.
LoadControlState Restores control-state information.
LoadViewState Restores view-state information.
MapPathSecure Retrieves the physical path that a virtual path, either
absolute or relative, maps to.
MemberwiseClone Creates a shallow copy of the current object.
MergeStyle Copies any nonblank elements of the specified style to the
web control, but does not overwrite any existing style
elements of the control.
OnBubbleEvent Determines whether the event for the server control is
passed up the page's UI server control hierarchy.
OnDataBinding Raises the data binding event.
OnInit Raises the Init event.
OnLoad Raises the Load event.
OnPreRender Raises the PreRender event.
OnUnload Raises the Unload event.
OpenFile Gets a Stream used to read a file.

41 | P a g e
RemovedControl Called after a child control is removed from the controls
collection of the control object.
Render Renders the control to the specified HTML writer.
RenderBeginTag Renders the HTML opening tag of the control to the
specified writer.
RenderChildren Outputs the contents of a server control's children to a
provided HtmlTextWriter object, which writes the contents
to be rendered on the client.
RenderContents Renders the contents of the control to the specified writer.
RenderControl(HtmlTextWriter) Outputs server control content to a provided
HtmlTextWriter object and stores tracing information
about the control if tracing is enabled.
RenderEndTag Renders the HTML closing tag of the control into the
specified writer.
ResolveAdapter Gets the control adapter responsible for rendering the
specified control.
SaveControlState Saves any server control state changes that have occurred
since the time the page was posted back to the server.
SaveViewState Saves any state that was modified after the
TrackViewState method was invoked.
SetDesignModeState Sets design-time data for a control.
ToString Returns a string that represents the current object.

42 | P a g e
TrackViewState Causes the control to track changes to its view state so that
they can be stored in the object's view state property.
Example
Let us look at a particular server control - a tree view control. A Tree view control comes under
navigation controls. Other Navigation controls are: Menu control and SiteMapPath control.
Add a tree view control on the page. Select Edit Nodes... from the tasks. Edit each of the nodes
using the Tree view node editor as shown:
Once you have created the nodes, it looks like the following in design view:
The AutoFormat... task allows you to format the tree view as shown:

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Add a label control and a text box control on the page and name them lblmessage and txtmessage
respectively.
Write a few lines of code to ensure that when a particular node is selected, the label control displays
the node text and the text box displays all child nodes under it, if any. The code behind the file
should look like this:
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
namespace eventdemo {
public partial class treeviewdemo : System.Web.UI.Page {
protected void Page_Load(object sender, EventArgs e) {
txtmessage.Text = " ";
}
protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e) {
lblmessage.Text = "Selected node changed to: " + TreeView1.SelectedNode.Text;

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Execute the page to see the effects. You will be able to expand and collapse the nodes.
ASP.NET - HTML Server
The HTML server controls are basically the standard HTML controls enhanced to enable server
side processing. The HTML controls such as the header tags, anchor tags, and input elements are
not processed by the server but are sent to the browser for display.
They are specifically converted to a server control by adding the attribute runat="server" and
adding an id attribute to make them available for server-side processing.
For example, consider the HTML input control:
It could be converted to a server control, by adding the runat and id attribute:
TreeNodeCollection childnodes = TreeView1.SelectedNode.ChildNodes;
if(childnodes != null) {
foreach (TreeNode t in childnodes) {
txtmessage.Text += t.Value;
}
}
}
}
}
<input type="text" size="40">
<input type="text" id="testtext" size="40" runat="server">

45 | P a g e
Advantages of using HTML Server Controls
Although ASP.NET server controls can perform every job accomplished by the HTML server
controls, the later controls are useful in the following cases:
 Using static tables for layout purposes.
 Converting a HTML page to run under ASP.NET
The following table describes the HTML server controls:
Control Name HTML tag
HtmlHead <head>element
HtmlInputButton <input type=button|submit|reset>
HtmlInputCheckbox <input type=checkbox>
HtmlInputFile <input type = file>
HtmlInputHidden <input type = hidden>
HtmlInputImage <input type = image>
HtmlInputPassword <input type = password>
HtmlInputRadioButto <input type = radio>
HtmlInputReset <input type = reset>
HtmlText <input type = text|password>
HtmlImage <img> element
HtmlLink <link> element
HtmlAnchor <a> element
HtmlButton <button> element
HtmlButton <button> element
HtmlForm <form> element
HtmlTable <table> element
HtmlTableCell <td> and <th>
HtmlTableRow <tr> element
HtmlTitle <title> element
HtmlSelect <select&t; element
HtmlGenericControl All HTML controls not listed
Example
The following example uses a basic HTML table for layout. It uses some boxes for getting input
from the users such as name, address, city, state etc. It also has a button control, which is clicked
to get the user data displayed in the last row of the table.

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The page should look like this in the design view:
The code for the content page shows the use of the HTML table element for layout.
Inherits="htmlserver._Default" %>
<style type="text/css">
.style1
{
width: 156px;
}
.style2
{
width: 332px;
}
</style>
</head>
<body>
<div>
<table style="width: 54%;">
<tr>
<td class="style1">Name:</td>
<td class="style2">
<asp:TextBox ID="txtname" runat="server" style="width:230px">
</asp:TextBox>

47 | P a g e
</td>
</tr>
<tr>
<td class="style1">Street</td>
<td class="style2">
<asp:TextBox ID="txtstreet" runat="server" style="width:230px">
</asp:TextBox>
</td>
</tr>
<tr>
<td class="style1">City</td>
<td class="style2">
<asp:TextBox ID="txtcity" runat="server" style="width:230px">
</asp:TextBox>
</td>
</tr>
<tr>
<td class="style1">State</td>
<td class="style2">
<asp:TextBox ID="txtstate" runat="server" style="width:230px">
</asp:TextBox>
</td>
</tr>
<tr>
<td class="style1"> </td>
<td class="style2"></td>
</tr>
<tr>
<td class="style1"></td>
<td ID="displayrow" runat ="server" class="style2">
</td>
</tr>
</table>
</div>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Click" />
</form>
</body>
</html>
The code behind the button control:

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Observe the following:
 The standard HTML tags have been used for the page layout.
 The last row of the HTML table is used for data display. It needed server side processing,
so an ID attribute and the runat attribute has been added to it.
ASP.NET - Client Side
ASP.NET client side coding has two aspects:
 Client side scripts : It runs on the browser and in turn speeds up the execution of page. For
example, client side data validation which can catch invalid data and warn the user
accordingly without making a round trip to the server.
 Client side source code : ASP.NET pages generate this. For example, the HTML source
code of an ASP.NET page contains a number of hidden fields and automatically injected
blocks of JavaScript code, which keeps information like view state or does other jobs to
make the page work.
Client Side Scripts
All ASP.NET server controls allow calling client side code written using JavaScript or VBScript.
Some ASP.NET server controls use client side scripting to provide response to the users without
posting back to the server. For example, the validation controls.
Apart from these scripts, the Button control has a property OnClientClick, which allows executing
client-side script, when the button is clicked.
The traditional and server HTML controls have the following events that can execute a script when
they are raised:
Event Description
onblur When the control loses focus
{
string str = "";
str += txtname.Text + "<br />";
str += txtstreet.Text + "<br />";
str += txtcity.Text + "<br />";
str += txtstate.Text + "<br />";
displayrow.InnerHtml = str;
}

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onfocus When the control receives focus
onclick When the control is clicked
onchange When the value of the control changes
onkeydown When the user presses a key
onkeypress When the user presses an alphanumeric key
onkeyup When the user releases a key
onmouseover When the user moves the mouse pointer over the control
onserverclick It raises the ServerClick event of the control, when the control is clicked
Client Side Source Code
We have already discussed that, ASP.NET pages are generally written in two files:
 The content file or the markup file ( .aspx)
 The code-behind file
The content file contains the HTML or ASP.NET control tags and literals to form the structure of
the page. The code behind file contains the class definition. At run-time, the content file is parsed
and transformed into a page class.
This class, along with the class definition in the code file, and system generated code, together
make the executable code (assembly) that processes all posted data, generates response, and sends
it back to the client.
Consider the simple page:
Inherits="clientside._Default" %>
<title>
Untitled Page
</title>
</head>
<body>
<div>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

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When this page is run on the browser, the View Source option shows the HTML page sent to the
browser by the ASP.Net runtime:
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Click" />
</div>
<hr />
<h3> <asp:Label ID="Msg" runat="server" Text=""> </asp:Label> </h3>
</form>
</body>
</html>
<head>
<title>
Untitled Page
</title>
</head>
<body>
<form name="form1" method="post" action="Default.aspx" id="form1">
<div>
<input type="hidden" name=" VIEWSTATE" id=" VIEWSTATE"
value="/wEPDwUKMTU5MTA2ODYwOWRk31NudGDgvhhA7joJum9Qn5RxU2M=" />
</div>
<div>
<input type="hidden" name=" EVENTVALIDATION"
id=" EVENTVALIDATION"
value="/wEWAwKpjZj0DALs0bLrBgKM54rGBhHsyM61rraxE+KnBTCS8cd1QDJ/"/>
</div>
<div>
<input name="TextBox1" type="text" id="TextBox1" />
<input type="submit" name="Button1" value="Click" id="Button1" />
</div>
<hr />
<h3><span id="Msg"></span></h3>

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If you go through the code properly, you can see that first two <div> tags contain the hidden
fields which store the view state and validation information.
ASP.NET - Basic Controls
Button Controls
ASP.NET provides three types of button control:
 Button : It displays text within a rectangular area.
 Link Button : It displays text that looks like a hyperlink.
 Image Button : It displays an image.
When a user clicks a button, two events are raised: Click and Command.
Basic syntax of button control:
Common properties of the button control:
Text The text displayed on the button. This is for button and link
button controls only.
ImageUrl For image button control only. The image to be displayed for
the button.
AlternateText For image button control only. The text to be displayed if the
browser cannot display the image.
CausesValidation Determines whether page validation occurs when a user clicks
</form>
</body>
</html>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Click" / >

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the button. The default is true.
CommandName A string value that is passed to the command event when a user
clicks the button.
CommandArgument A string value that is passed to the command event when a user
clicks the button.
PostBackUrl The URL of the page that is requested when the user clicks the
button.
Text Boxes and Labels
Text box controls are typically used to accept input from the user. A text box control can accept
one or more lines of text depending upon the settings of the TextMode attribute.
Label controls provide an easy way to display text which can be changed from one execution of
a page to the next. If you want to display text that does not change, you use the literal text.
Basic syntax of text control:
Common Properties of the Text Box and Labels:
TextMode Specifies the type of text box. SingleLine creates a standard
text box, MultiLIne creates a text box that accepts more than
one line of text and the Password causes the characters that
are entered to be masked. The default is SingleLine.
Text The text content of the text box.
MaxLength The maximum number of characters that can be entered into
the text box.
Wrap It determines whether or not text wraps automatically for
multi-line text box; default is true.
<asp:TextBox ID="txtstate" runat="server" ></asp:TextBox>

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ReadOnly Determines whether the user can change the text in the box;
default is false, i.e., the user can not change the text.
Columns The width of the text box in characters. The actual width is
determined based on the font that is used for the text entry.
Rows The height of a multi-line text box in lines. The default
value is 0, means a single line text box.
The mostly used attribute for a label control is 'Text', which implies the text displayed on the label.
Check Boxes and Radio Buttons
A check box displays a single option that the user can either check or uncheck and radio buttons
present a group of options from which the user can select just one option.
To create a group of radio buttons, you specify the same name for the GroupName attribute of
each radio button in the group. If more than one group is required in a single form, then specify a
different group name for each group.
If you want check box or radio button to be selected when the form is initially displayed, set its
Checked attribute to true. If the Checked attribute is set to true for multiple radio buttons in a
group, then only the last one is considered as true.
Basic syntax of check box:
Basic syntax of radio button:
Common properties of check boxes and radio buttons:
Text The text displayed next to the check box or radio button.
Checked Specifies whether it is selected or not, default is false.
GroupName Name of the group the control belongs to.
<asp:CheckBox ID= "chkoption" runat= "Server">
</asp:CheckBox>
<asp:RadioButton ID= "rdboption" runat= "Server">
</asp: RadioButton>

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List Controls
ASP.NET provides the following controls
 Drop-down list,
 List box,
 Radio button list,
 Check box list,
 Bulleted list.
These control let a user choose from one or more items from the list. List boxes and drop-down
lists contain one or more list items. These lists can be loaded either by code or by the
ListItemCollection editor.
Basic syntax of list box control:
Basic syntax of drop-down list control:
Common properties of list box and drop-down Lists:
Items The collection of ListItem objects that represents the items
in the control. This property returns an object of type
ListItemCollection.
Rows Specifies the number of items displayed in the box. If actual
list contains more rows than displayed then a scroll bar is
added.
SelectedIndex The index of the currently selected item. If more than one
item is selected, then the index of the first selected item. If
<asp:ListBox ID="ListBox1" runat="server" AutoPostBack="True"
OnSelectedIndexChanged="ListBox1_SelectedIndexChanged">
</asp:ListBox>
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"
OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
</asp:DropDownList>

55 | P a g e
no item is selected, the value of this property is -1.
SelectedValue The value of the currently selected item. If more than one
item is selected, then the value of the first selected item. If
no item is selected, the value of this property is an empty
string ("").
SelectionMode Indicates whether a list box allows single selections or
multiple selections.
Common properties of each list item objects:
Text The text displayed for the item.
Selected Indicates whether the item is selected.
Value A string value associated with the item.
It is important to notes that:
 To work with the items in a drop-down list or list box, you use the Items property of the
control. This property returns a ListItemCollection object which contains all the items of
the list.
 The SelectedIndexChanged event is raised when the user selects a different item from a
drop-down list or list box.
The ListItemCollection
The ListItemCollection object is a collection of ListItem objects. Each ListItem object represents
one item in the list. Items in a ListItemCollection are numbered from 0.
When the items into a list box are loaded using strings like: lstcolor.Items.Add("Blue"), then
both the Text and Value properties of the list item are set to the string value you specify. To set it
differently you must create a list item object and then add that item to the collection.
The ListItemCollection Editor is used to add item to a drop-down list or list box. This is used to
create a static list of items. To display the collection editor, select edit item from the smart tag
menu, or select the control and then click the ellipsis button from the Item property in the properties
window.

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Common properties of ListItemCollection:
Item(integer) A ListItem object that represents the item at the specified
index.
Count The number of items in the collection.
Common methods of ListItemCollection:
Methods Description
Add(string) Adds a new item at the end of the collection and assigns the
string parameter to the Text property of the item.
Add(ListItem) Adds a new item at the end of the collection.
Insert(integer, string) Inserts an item at the specified index location in the
collection, and assigns string parameter to the text property
of the item.
Insert(integer, ListItem) Inserts the item at the specified index location in the
collection.
Remove(string) Removes the item with the text value same as the string.
Remove(ListItem) Removes the specified item.
RemoveAt(integer) Removes the item at the specified index as the integer.
Clear Removes all the items of the collection.
FindByValue(string) Returns the item whose value is same as the string.

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FindByValue(Text) Returns the item whose text is same as the string.
Radio Button list and Check Box list
A radio button list presents a list of mutually exclusive options. A check box list presents a list of
independent options. These controls contain a collection of ListItem objects that could bereferred
to through the Items property of the control.
Basic syntax of radio button list:
Basic syntax of check box list:
Common properties of check box and radio button lists:
RepeatLayout This attribute specifies whether the table tags or the normal
html flow to use while formatting the list when it is rendered.
The default is Table.
RepeatDirection It specifies the direction in which the controls to be repeated.
The values available are Horizontal and Vertical. Default is
Vertical.
RepeatColumns It specifies the number of columns to use when repeating the
controls; default is 0.
Bulleted lists and Numbered lists
The bulleted list control creates bulleted lists or numbered lists. These controls contain a
collection of ListItem objects that could be referred to through the Items property of the control.
Basic syntax of a bulleted list:
<asp:RadioButtonList ID="RadioButtonList1" runat="server" AutoPostBack="True"
OnSelectedIndexChanged="RadioButtonList1_SelectedIndexChanged">
</asp:RadioButtonList>
<asp:CheckBoxList ID="CheckBoxList1" runat="server" AutoPostBack="True"
OnSelectedIndexChanged="CheckBoxList1_SelectedIndexChanged">
</asp:CheckBoxList>
<asp:BulletedList ID="BulletedList1" runat="server">
</asp:BulletedList>

58 | P a g e
Common properties of the bulleted list:
BulletStyle This property specifies the style and looks of the bullets, or
RepeatDirection It specifies the direction in which the controls to be
repeated. The values available are Horizontal and Vertical.
Default is Vertical.
RepeatColumns It specifies the number of columns to use when repeating
HyperLink Control
The HyperLink control is like the HTML <a> element.
Basic syntax for a hyperlink control:
It has the following important properties:
ImageUrl Path of the image to be displayed by the control.
NavigateUrl Target link URL.
Text The text to be displayed as the link.
Target The window or frame which loads the linked page.
Image Control
The image control is used for displaying images on the web page, or some alternative text, if the
image is not available.
Basic syntax for an image control:
It has the following important properties:
AlternateTex Alternate text to be displayed in absence of the image.
ImageAlign Alignment options for the control.
ImageUrl Path of the image to be displayed by the control.
<asp:HyperLink ID="HyperLink1" runat="server">
HyperLink
</asp:HyperLink>
<asp:Image ID="Image1" runat="server">

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ASP.NET – Validators
ASP.NET validation controls validate the user input data to ensure that useless, unauthenticated,
or contradictory data don't get stored.
ASP.NET provides the following validation controls:
 RequiredFieldValidator
 RangeValidator
 CompareValidator
 RegularExpressionValidator
 CustomValidator
 ValidationSummary
BaseValidator Class
The validation control classes are inherited from the BaseValidator class hence they inherit its
properties and methods. Therefore, it would help to take a look at the properties and the methods
of this base class, which are common for all the validation controls:
Members Description
ControlToValidate Indicates the input control to validate.
Display Indicates how the error message is shown.
EnableClientScrip Indicates whether client side validation will take.
Enabled Enables or disables the validator.
ErrorMessage Indicates error string.
Text Error text to be shown if validation fails.
IsValid Indicates whether the value of the control is valid.
SetFocusOnError It indicates whether in case of an invalid control, the focus should switch to
the related input control.
ValidationGroup The logical group of multiple validators, where this control belongs.
Validate() This method revalidates the control and updates the IsValid property.

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RequiredFieldValidator Control
The RequiredFieldValidator control ensures that the required field is not empty. It is generally
tied to a text box to force input into the text box.
The syntax of the control is as given:
RangeValidator Control
The RangeValidator control verifies that the input value falls within a predetermined range.
It has three specific properties:
Properties Description
Type It defines the type of the data. The available values are: Currency, Date,
Double, Integer, and String.
MinimumValue It specifies the minimum value of the range.
MaximumValu It specifies the maximum value of the range.
CompareValidator Control
The CompareValidator control compares a value in one control with a fixed value or a value in
another control.
It has the following specific properties:
Type It specifies the data type.
ControlToCompare It specifies the value of the input control to compare with.
ValueToCompare It specifies the constant value to compare with.
Operator It specifies the comparison operator, the available values are:
<asp:RequiredFieldValidator ID="rfvcandidate"
runat="server" ControlToValidate ="ddlcandidate"
ErrorMessage="Please choose a candidate"
InitialValue="Please choose a candidate">
</asp:RequiredFieldValidator>
<asp:RangeValidator ID="rvclass" runat="server" ControlToValidate="txtclass"
ErrorMessage="Enter your class (6 - 12)" MaximumValue="12"
MinimumValue="6" Type="Integer">
</asp:RangeValidator>

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Equal, NotEqual, GreaterThan, GreaterThanEqual, LessThan,
LessThanEqual, and DataTypeCheck.
The basic syntax of the control is as follows:
RegularExpressionValidator
The RegularExpressionValidator allows validating the input text by matching against a pattern of
a regular expression. The regular expression is set in the ValidationExpression property.
The following table summarizes the commonly used syntax constructs for regular expressions:
Character Description
b Matches a backspace.
t Matches a tab.
r Matches a carriage return.
v Matches a vertical tab.
f Matches a form feed.
n Matches a new line.
Escape character.
Apart from single character match, a class of characters could be specified that can be matched,
called the metacharacters.
Metacharacter Description
. Matches any character except n.
[abcd] Matches any character in the set.
[^abcd] Excludes any character in the set.
[2-7a-mA-M] Matches any character specified in the range.
w Matches any alphanumeric character and underscore.
W Matches any non-word character.
s Matches whitespace characters like, space, tab, new line etc.
S Matches any non-whitespace character.
d Matches any decimal character.
D Matches any non-decimal character.
<asp:CompareValidator ID="CompareValidator1" runat="server"
ErrorMessage="CompareValidator">
</asp:CompareValidator>

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Quantifiers could be added to specify number of times a character could appear.
Quantifier Description
* Zero or more matches.
+ One or more matches.
? Zero or one matches.
{N} N matches.
{N,} N or more matches.
{N,M} Between N and M matches.
CustomValidator
The CustomValidator control allows writing application specific custom validation routines for
both the client side and the server side validation.
The client side validation is accomplished through the ClientValidationFunction property. The
client side validation routine should be written in a scripting language, such as JavaScript or
VBScript, which the browser can understand.
The server side validation routine must be called from the control's ServerValidate event handler.
The server side validation routine should be written in any .Net language, like C# or VB.Net.
The basic syntax for the control is as given:
ValidationSummary
The ValidationSummary control does not perform any validation but shows a summary of all
errors in the page. The summary displays the values of the ErrorMessage property of all validation
controls that failed validation.
The following two mutually inclusive properties list out the error message:
 ShowSummary : shows the error messages in specified format.
 ShowMessageBox : shows the error messages in a separate window.
The syntax for the control is as given:
<asp:RegularExpressionValidator ID="string" runat="server" ErrorMessage="string"
ValidationExpression="string" ValidationGroup="string">
</asp:RegularExpressionValidator>
<asp:CustomValidator ID="CustomValidator1" runat="server"
ClientValidationFunction=.cvf_func. ErrorMessage="CustomValidator">
</asp:CustomValidator>

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Validation Groups
Complex pages have different groups of information provided in different panels. In suchsituation,
a need might arise for performing validation separately for separate group. This kind ofsituation
is handled using validation groups.
To create a validation group, you should put the input controls and the validation controls into
the same logical group by setting their ValidationGroup property.
Example
The following example describes a form to be filled up by all the students of a school, divided into
four houses, for electing the school president. Here, we use the validation controls tovalidate
the user input.
This is the form in design view:
<asp:ValidationSummary ID="ValidationSummary1" runat="server"
DisplayMode = "BulletList" ShowSummary = "true" HeaderText="Errors:" />
<table style="width: 66%;">
<tr>
<td class="style1" colspan="3" align="center">
<asp:Label ID="lblmsg"
Text="President Election Form : Choose your president"
runat="server" />
</td>
</tr>
<tr>
<td class="style3">

64 | P a g e
Candidate:
</td>
<td class="style2">
<asp:DropDownList ID="ddlcandidate" runat="server" style="width:239px">
<asp:ListItem>Please Choose a Candidate</asp:ListItem>
<asp:ListItem>M H Kabir</asp:ListItem>
<asp:ListItem>Steve Taylor</asp:ListItem>
<asp:ListItem>John Abraham</asp:ListItem>
<asp:ListItem>Venus Williams</asp:ListItem>
</asp:DropDownList>
</td>
<td>
<asp:RequiredFieldValidator ID="rfvcandidate"
runat="server" ControlToValidate ="ddlcandidate"
ErrorMessage="Please choose a candidate"
InitialValue="Please choose a candidate">
</td>
</tr>
<tr>
<td class="style3">
House:
</td>
<td class="style2">
<asp:RadioButtonList ID="rblhouse" runat="server" RepeatLayout="Flow">
<asp:ListItem>Red</asp:ListItem>
<asp:ListItem>Blue</asp:ListItem>
<asp:ListItem>Yellow</asp:ListItem>
<asp:ListItem>Green</asp:ListItem>
</asp:RadioButtonList>
</td>
<td>
<asp:RequiredFieldValidator ID="rfvhouse" runat="server"
ControlToValidate="rblhouse" ErrorMessage="Enter your house name" >
<br />
</td>
</tr>
<tr>
<td class="style3">

65 | P a g e
Class:
</td>
<td class="style2">
<asp:TextBox ID="txtclass" runat="server"></asp:TextBox>
</td>
<td>
<asp:RangeValidator ID="rvclass"
runat="server" ControlToValidate="txtclass"
ErrorMessage="Enter your class (6 - 12)" MaximumValue="12"
MinimumValue="6" Type="Integer">
</asp:RangeValidator>
</td>
</tr>
<tr>
<td class="style3">
Email:
</td>
<td class="style2">
<asp:TextBox ID="txtemail" runat="server" style="width:250px">
</asp:TextBox>
</td>
<td>
<asp:RegularExpressionValidator ID="remail" runat="server"
ControlToValidate="txtemail" ErrorMessage="Enter your email"
ValidationExpression="w+([-+.']w+)*@w+([-.]w+)*.w+([-.]w+)*">
</asp:RegularExpressionValidator>
</td>
</tr>
<tr>
<td class="style3" align="center" colspan="3">
<asp:Button ID="btnsubmit" runat="server" onclick="btnsubmit_Click"
style="text-align: center" Text="Submit" style="width:140px" />
</td>
</tr>
</table>
<asp:ValidationSummary ID="ValidationSummary1" runat="server"
DisplayMode ="BulletList" ShowSummary ="true" HeaderText="Errors:" />
</form>
The code behind the submit button:

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ASP.NET - File Uploading
ASP.NET has two controls that allow users to upload files to the web server. Once the server
receives the posted file data, the application can save it, check it, or ignore it. The following
controls allow the file uploading:
 HtmlInputFile - an HTML server control
 FileUpload - and ASP.NET web control
Both controls allow file uploading, but the FileUpload control automatically sets the encoding of
the form, whereas the HtmlInputFile does not do so.
protected void btnsubmit_Click(object sender, EventArgs e)
{
if (Page.IsValid)
{
lblmsg.Text = "Thank You";
}
else
{
lblmsg.Text = "Fill up all the fields";
}
}

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In this tutorial, we use the FileUpload control. The FileUpload control allows the user to browse
for and select the file to be uploaded, providing a browse button and a text box for entering the
filename.
Once, the user has entered the filename in the text box by typing the name or browsing, the SaveAs
method of the FileUpload control can be called to save the file to the disk.
The basic syntax of FileUpload is:
The FileUpload class is derived from the WebControl class, and inherits all its members. Apart
from those, the FileUpload class has the following read-only properties:
FileBytes Returns an array of the bytes in a file to be uploaded.
FileConten Returns the stream object pointing to the file to be uploaded.
FileName Returns the name of the file to be uploaded.
HasFile Specifies whether the control has a file to upload.
PostedFile Returns a reference to the uploaded file.
The posted file is encapsulated in an object of type HttpPostedFile, which could be accessed
through the PostedFile property of the FileUpload class.
The HttpPostedFile class has the following frequently used properties:
ContentLengt Returns the size of the uploaded file in bytes.
ContentType Returns the MIME type of the uploaded file.
FileName Returns the full filename.
InputStream Returns a stream object pointing to the uploaded file.
Example
The following example demonstrates the FileUpload control and its properties. The form has a
FileUpload control along with a save button and a label control for displaying the file name, file
type, and file length.
In the design view, the form looks as follows:
<asp:FileUpload ID= "Uploader" runat = "server" />

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The code behind the save button is as given:
<body>
<div>
<h3> File Upload:</h3>
<br />
<asp:FileUpload ID="FileUpload1" runat="server" />
<br /><br />
<asp:Button ID="btnsave" runat="server" onclick="btnsave_Click" Text="Save"
style="width:85px" />
<br /><br />
<asp:Label ID="lblmessage" runat="server" />
</div>
</form>
</body>
protected void btnsave_Click(object sender, EventArgs e)
{
StringBuilder sb = new StringBuilder();
if (FileUpload1.HasFile)
{
try
{
sb.AppendFormat(" Uploading file: {0}", FileUpload1.FileName);
//saving the file
FileUpload1.SaveAs("<c:SaveDirectory>" + FileUpload1.FileName);
//Showing the file information

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Note the following:
 The StringBuilder class is derived from System.IO namespace, so it needs to be included.
 The try and catch blocks are used for catching errors, and display the error message.
ASP.NET - Ad Rotator
The AdRotator control randomly selects banner graphics from a list, which is specified in an
external XML schedule file. This external XML schedule file is called the advertisement file.
sb.AppendFormat("<br/> Save As: {0}", FileUpload1.PostedFile.FileName);
sb.AppendFormat("<br/> File type: {0}", FileUpload1.PostedFile.ContentType);
sb.AppendFormat("<br/> File length: {0}", FileUpload1.PostedFile.ContentLength);
sb.AppendFormat("<br/> File name: {0}", FileUpload1.PostedFile.FileName);
}catch (Exception ex)
{
sb.Append("<br/> Error <br/>");
sb.AppendFormat("Unable to save file <br/> {0}", ex.Message);
}
}
else
{
lblmessage.Text = sb.ToString();
}
}

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The AdRotator control allows you to specify the advertisement file and the type of window that
the link should follow in the AdvertisementFile and the Target property respectively.
The basic syntax of adding an AdRotator is as follows:
Before going into the details of the AdRotator control and its properties, let us look into the
construction of the advertisement file.
The Advertisement File
The advertisement file is an XML file, which contains the information about the advertisements
to be displayed.
Extensible Markup Language (XML) is a W3C standard for text document markup. It is a text-
based markup language that enables you to store data in a structured format by using meaningful
tags. The term 'extensible' implies that you can extend your ability to describe a document by
defining meaningful tags for the application.
XML is not a language in itself, like HTML, but a set of rules for creating new markup languages.
It is a meta-markup language. It allows developers to create custom tag sets forspecial uses.
It structures, stores, and transports the information.
Following is an example of XML file:
Like all XML files, the advertisement file needs to be a structured text file with well-defined tags
delineating the data. There are the following standard XML elements that are commonly used in
the advertisement file:
Element Description
Advertisements Encloses the advertisement file.
Ad Delineates separate ad.
ImageUrl The path of image that will be displayed.
NavigateUrl The link that will be followed when the user clicks the ad.
AlternateText The text that will be displayed instead of the picture if it
cannot be displayed.
Keyword Keyword identifying a group of advertisements. This is used
for filtering.
<asp:AdRotator runat = "server" AdvertisementFile = "adfile.xml" Target = "_blank" />
<BOOK>
<NAME> Learn XML </NAME>
<AUTHOR> Samuel Peterson </AUTHOR>
<PUBLISHER> NSS Publications </PUBLISHER>
<PRICE> $30.00</PRICE>
</BOOK>

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Impressions The number indicating how often an advertisement will
appear.
Height Height of the image to be displayed.
Width Width of the image to be displayed.
Apart from these tags, customs tags with custom attributes could also be included. The following
code illustrates an advertisement file ads.xml:
<Advertisements>
<Ad>
<ImageUrl>rose1.jpg</ImageUrl>
<NavigateUrl>http://www.1800flowers.com</NavigateUrl>
<AlternateText>
Order flowers, roses, gifts and more
</AlternateText>
<Impressions>20</Impressions>
<Keyword>flowers</Keyword>
</Ad>
<Ad>
<NavigateUrl>http://www.babybouquets.com.au</NavigateUrl>
<AlternateText>Order roses and flowers</AlternateText>
<Keyword>gifts</Keyword>
</Ad>
<Ad>
<NavigateUrl>http://www.flowers2moscow.com</NavigateUrl>
<AlternateText>Send flowers to Russia</AlternateText>
<Keyword>russia</Keyword>
</Ad>
<Ad>
<NavigateUrl>http://www.edibleblooms.com</NavigateUrl>
<AlternateText>Edible Blooms</AlternateText>
<Keyword>gifts</Keyword>
</Ad>
</Advertisements>

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Properties and Events of the AdRotator Class
The AdRotator class is derived from the WebControl class and inherits its properties. Apart from
those, the AdRotator class has the following properties:
AdvertisementFile The path to the advertisement file.
AlternateTextFeil
d
The element name of the field where alternate text is provided. The default
value is AlternateText.
DataMember The name of the specific list of data to be bound when advertisement file is
not used.
DataSource Control from where it would retrieve data.
DataSourceID Id of the control from where it would retrieve data.
Font Specifies the font properties associated with the advertisement banner
control.
ImageUrlField The element name of the field where the URL for the image is provided.
The default value is ImageUrl.
KeywordFilter For displaying the keyword based ads only.
NavigateUrlField The element name of the field where the URL to navigate to is provided.
The default value is NavigateUrl.
Target The browser window or frame that displays the content of the page linked.
UniqueID Obtains the unique, hierarchically qualified identifier for the AdRotator
control.
Following are the important events of the AdRotator class:
Events Description
AdCreated It is raised once per round trip to the server after creation of
the control, but before the page is rendered
DataBinding Occurs when the server control binds to a data source.
DataBound Occurs after the server control binds to a data source.
Disposed Occurs when a server control is released from memory, which
is the last stage of the server control lifecycle when an
ASP.NET page is requested

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Init Occurs when the server control is initialized, which is the first
step in its lifecycle.
Load Occurs when the server control is loaded into the Page object.
PreRender Occurs after the Control object is loaded but prior to
rendering.
Unload Occurs when the server control is unloaded from memory.
Working with AdRotator Control
Create a new web page and place an AdRotator control on it.
The ads.xml file and the image files should be located in the root directory of the web site.
Try to execute the above application and observe that each time the page is reloaded, the ad is
changed.
ASP.NET – Calendars
The calendar control is a functionally rich web control, which provides the following
capabilities:
 Displaying one month at a time
 Selecting a day, a week or a month
 Selecting a range of days
 Moving from month to month
 Controlling the display of the days programmatically
The basic syntax of a calendar control is:
<div>
<asp:AdRotator ID="AdRotator1" runat="server" AdvertisementFile ="~/ads.xml"
onadcreated="AdRotator1_AdCreated" />
</div>
</form>
<asp:Calender ID = "Calendar1" runat = "server">
</asp:Calender>

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Properties and Events of the Calendar Control
The calendar control has many properties and events, using which you can customize the actions
and display of the control. The following table provides some important properties of theCalendar
control:
Caption Gets or sets the caption for the calendar control.
CaptionAlign Gets or sets the alignment for the caption.
CellPadding Gets or sets the number of spaces between the data and the cell border.
CellSpacing Gets or sets the space between cells.
DayHeaderStyle Gets the style properties for the section that displays the day of the week.
DayNameFormat Gets or sets format of days of the week.
DayStyle Gets the style properties for the days in the displayed month.
FirstDayOfWeek Gets or sets the day of week to display in the first column.
NextMonthText Gets or sets the text for next month navigation control. The default value is >.
NextPrevFormat Gets or sets the format of the next and previous month navigation control.
OtherMonthDayStyle Gets the style properties for the days on the Calendar control that are not in
the displayed month.
PrevMonthText Gets or sets the text for previous month navigation control. The default value
is <.
SelectedDate Gets or sets the selected date.
SelectedDates Gets a collection of DateTime objects representing the selected dates.
SelectedDayStyle Gets the style properties for the selected dates.
SelectionMode Gets or sets the selection mode that specifies whether the user can select a
single day, a week or an entire month.
SelectMonthText Gets or sets the text for the month selection element in the selector column.
SelectorStyle Gets the style properties for the week and month selector column.
SelectWeekText Gets or sets the text displayed for the week selection element in the selector
column.
ShowDayHeader Gets or sets the value indicating whether the heading for the days of the week
is displayed.

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ShowGridLines Gets or sets the value indicating whether the gridlines would be shown.
ShowNextPrevMonth Gets or sets a value indicating whether next and previous month navigation
elements are shown in the title section.
ShowTitle Gets or sets a value indicating whether the title section is displayed.
TitleFormat Gets or sets the format for the title section.
Titlestyle Get the style properties of the title heading for the Calendar control.
TodayDayStyle Gets the style properties for today's date on the Calendar control.
TodaysDate Gets or sets the value for today's date.
UseAccessibleHeader Gets or sets a value that indicates whether to render the table header <th>
HTML element for the day headers instead of the table data <td> HTML
element.
VisibleDate Gets or sets the date that specifies the month to display.
WeekendDayStyle Gets the style properties for the weekend dates on the Calendar control.
The Calendar control has the following three most important events that allow the developers to
program the calendar control. They are:
Events Description
SelectionChanged It is raised when a day, a week or an entire month is selected.
DayRender It is raised when each data cell of the calendar control is rendered.
VisibleMonthChanged It is raised when user changes a month.
Working with the Calendar Control
Putting a bare-bone calendar control without any code behind file provides a workable calendar to
a site, which shows the months and days of the year. It also allows navigation to next and previous
months.

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Calendar controls allow the users to select a single day, a week, or an entire month. This is done
by using the SelectionMode property. This property has the following values:
Day To select a single day.
DayWeek To select a single day or an entire week.
DayWeekMonth To select a single day, a week, or an entire month.
None Nothing can be selected.
The syntax for selecting days:
When the selection mode is set to the value DayWeekMonth, an extra column with the > symbol
appears for selecting the week, and a >> symbol appears to the left of the days name for selecting
the month.
<asp:Calender ID = "Calendar1" runat = "server" SelectionMode="DayWeekMonth">
</asp:Calender>

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Example
The following example demonstrates selecting a date and displays the date in a label:
The content file code is as follows:
The event handler for the event SelectionChanged:
Inherits="calendardemo._Default" %>
<title>
Untitled Page
</title>
</head>
<body>
<div>
<h3> Your Birthday:</h3>
<asp:Calendar ID="Calendar1" runat="server SelectionMode="DayWeekMonth"
onselectionchanged="Calendar1_SelectionChanged">
</asp:Calendar>
</div>
<p>Todays date is:
<asp:Label ID="lblday" runat="server"></asp:Label>
</p>
<p>Your Birday is:
<asp:Label ID="lblbday" runat="server"></asp:Label>
</p>
</form>
</body>
</html>
protected void Calendar1_SelectionChanged(object sender, EventArgs e)
{
lblday.Text = Calendar1.TodaysDate.ToShortDateString();
lblbday.Text = Calendar1.SelectedDate.ToShortDateString();
}

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When the file is run, it should produce the following output:
ASP.NET - Managing State
Hyper Text Transfer Protocol (HTTP) is a stateless protocol. When the client disconnects from the
server, the ASP.NET engine discards the page objects. This way, each web application can scale
up to serve numerous requests simultaneously without running out of server memory.
However, there needs to be some technique to store the information between requests and to
retrieve it when required. This information i.e., the current value of all the controls and variables
for the current user in the current session is called the State.
ASP.NET manages four types of states:
 View State
 Control State
 Session State
 Application State

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View State
The view state is the state of the page and all its controls. It is automatically maintained across
posts by the ASP.NET framework.
When a page is sent back to the client, the changes in the properties of the page and its controls
are determined, and stored in the value of a hidden input field named _VIEWSTATE. When the
page is again posted back, the _VIEWSTATE field is sent to the server with the HTTP request.
The view state could be enabled or disabled for:
 The entire application by setting the EnableViewState property in the <pages> section
of web.config file.
 A page by setting the EnableViewState attribute of the Page directive, as <%@ Page
Language="C#" EnableViewState="false" %>
 A control by setting the Control.EnableViewState property.
It is implemented using a view state object defined by the StateBag class which defines a collection
of view state items. The state bag is a data structure containing attribute value pairs, stored as
strings associated with objects.
The StateBag class has the following properties:
Item(name) The value of the view state item with the specified name.
This is the default property of the StateBag class.
Count The number of items in the view state collection.
Keys Collection of keys for all the items in the collection.
Values Collection of values for all the items in the collection.
The StateBag class has the following methods:
Methods Description
Add(name, value) Adds an item to the view state collection and existing item
is updated.
Clear Removes all the items from the collection.
Equals(Object) Determines whether the specified object is equal to the
current object.
Finalize Allows it to free resources and perform other cleanup

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operations.
GetEnumerator Returns an enumerator that iterates over all the key/value
pairs of the StateItem objects stored in the StateBag object.
IsItemDirty Checks a StateItem object stored in the StateBag object to
evaluate whether it has been modified.
Remove(name) Removes the specified item.
SetDirty Sets the state of the StateBag object as well as the Dirty
property of each of the StateItem objects contained by it.
SetItemDirty Sets the Dirty property for the specified StateItem object in
the StateBag object.
ToString Returns a string representing the state bag object.
Example
The following example demonstrates the concept of storing view state. Let us keep a counter,
which is incremented each time the page is posted back by clicking a button on the page. A label
control shows the value in the counter.
The markup file code is as follows:
Inherits="statedemo._Default" %>
<title>
Untitled Page
</title>
</head>

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The code behind file for the example is shown here:
<body>
<div>
<h3>View State demo</h3>
Page Counter:
<asp:Label ID="lblCounter" runat="server" />
<asp:Button ID="btnIncrement" runat="server" Text="Add Count"
onclick="btnIncrement_Click" />
</div>
</form>
</body>
</html>
public partial class _Default : System.Web.UI.Page
{
public int counter
{
get
{
if (ViewState["pcounter"] != null)
{
return ((int)ViewState["pcounter"]);
}
else
{
return 0;
}
}
set
{
ViewState["pcounter"] = value;
}
}
protected void Page_Load(object sender, EventArgs e)
{
lblCounter.Text = counter.ToString();
counter++;
}

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It would produce the following result:
Control State
Control state cannot be modified, accessed directly, or disabled.
Session State
When a user connects to an ASP.NET website, a new session object is created. When session state
is turned on, a new session state object is created for each new request. This session state object
becomes part of the context and it is available through the page.
Session state is generally used for storing application data such as inventory, supplier list, customer
record, or shopping cart. It can also keep information about the user and his preferences, and keep
the track of pending operations.
Sessions are identified and tracked with a 120-bit SessionID, which is passed from client to server
and back as cookie or a modified URL. The SessionID is globally unique and random.
The session state object is created from the HttpSessionState class, which defines a collection of
session state items.
The HttpSessionState class has the following properties:
SessionID The unique session identifier.
Item(name) The value of the session state item with the specified name.
This is the default property of the HttpSessionState class.
Count The number of items in the session state collection.
TimeOut Gets and sets the amount of time, in minutes, allowed
between requests before the session-state provider terminates
the session.
}

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The HttpSessionState class has the following methods:
The session state object is a name-value pair to store and retrieve some information from the
session state object. You could use the following code for the same:
The above code stores only strings in the Session dictionary object, however, it can store all the
primitive data types and arrays composed of primitive data types, as well as the DataSet,
DataTable, HashTable, and Image objects, as well as any user-defined class that inherits from the
ISerializable object.
Example
The following example demonstrates the concept of storing session state. There are two buttons
on the page, a text box to enter string and a label to display the text stored from last session.
The mark up file code is as follows:
Methods Description
Add(name, value) Adds an item to the session state collection.
Clear Removes all the items from session state collection.
Remove(name) Removes the specified item from the session state collection.
RemoveAll Removes all keys and values from the session-state collection.
RemoveAt Deletes an item at a specified index from the session-state collection.
void StoreSessionInfo()
{
String fromuser = TextBox1.Text;
Session["fromuser"] = fromuser;
}
void RetrieveSessionInfo()
{
String fromuser = Session["fromuser"];
Label1.Text = fromuser;
}
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs"
Inherits="_Default" %>

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<title>
Untitled Page
</title>
</head>
<body>
<div>
     
<table style="width: 568px; height: 103px">
<tr>
<td style="width: 209px">
<asp:Label ID="lblstr" runat="server" Text="Enter a String" style="width:94px">
</asp:Label>
</td>
<asp:TextBox ID="txtstr" runat="server" style="width:227px">
</asp:TextBox>
</td>
</tr>
<tr>
<td style="width: 209px"> </td>
</tr>
<tr>
<asp:Button ID="btnnrm" runat="server"
Text="No action button" style="width:128px" />
</td>
<asp:Button ID="btnstr" runat="server"
OnClick="btnstr_Click" Text="Submit the String" />
</td>
</tr>

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It should look like the following in design view:
The code behind file is given here:
<tr>
</tr>
<tr>
<asp:Label ID="lblsession" runat="server" style="width:231px" >
</asp:Label>
</td>
</tr>
<tr>
<asp:Label ID="lblshstr" runat="server">
</asp:Label>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
{
String mystr;

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Execute the file and observe how it works:
Application State
The ASP.NET application is the collection of all web pages, code and other files within a single
virtual directory on a web server. When information is stored in application state, it is available
to all the users.
To provide for the use of application state, ASP.NET creates an application state object for each
application from the HTTPApplicationState class and stores this object in server memory. This
object is represented by class file global.asax.
Application State is mostly used to store hit counters and other statistical data, global application
data like tax rate, discount rate etc. and to keep the track of users visiting the site.
The HttpApplicationState class has the following properties:
Item(name) The value of the application state item with the specified
name. This is the default property of the
HttpApplicationState class.
{
this.lblshstr.Text = this.mystr;
this.lblsession.Text = (String)this.Session["str"];
}
protected void btnstr_Click(object sender, EventArgs e)
{
this.mystr = this.txtstr.Text;
this.Session["str"] = this.txtstr.Text;
this.lblshstr.Text = this.mystr;
this.lblsession.Text = (String)this.Session["str"];
}
}

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Count The number of items in the application state collection.
The HttpApplicationState class has the following methods:
Methods Description
Add(name, value) Adds an item to the application state collection.
Clear Removes all the items from the application state collection.
Remove(name) Removes the specified item from the application state
collection.
RemoveAll Removes all objects from an HttpApplicationState
collection.
RemoveAt Removes an HttpApplicationState object from a collection
by index.
Lock() Locks the application state collection so only the current
user can access it.
Unlock() Unlocks the application state collection so all the users can
access it.
Application state data is generally maintained by writing handlers for the events:
 Application_Start
 Application_End
 Application_Error
 Session_Start
 Session_End
The following code snippet shows the basic syntax for storing application state information:
Void Application_Start(object sender, EventArgs e)
{
Application["startMessage"] = "The application has started.";

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ASP.NET - Custom Controls
ASP.NET allows the users to create controls. These user defined controls are categorized into:
 User controls
 Custom controls
User Controls
User controls behaves like miniature ASP.NET pages or web forms, which could be used by many
other pages. These are derived from the System.Web.UI.UserControl class. These controlshave
the following characteristics:
 They have an .ascx extension.
 They may not contain any <html>, <body>, or <form> tags.
 They have a Control directive instead of a Page directive.
To understand the concept, let us create a simple user control, which will work as footer for the
web pages. To create and use the user control, take the following steps:
 Create a new web application.
}
Void Application_End(object sender, EventArgs e)
{
Application["endtMessage"] = "The application has ended.";
}

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 Right click on the project folder on the Solution Explorer and choose Add New Item.
 Select Web User Control from the Add New Item dialog box and name it footer.ascx.
Initially, the footer.ascx contains only a Control directive.
 Add the following code to the file:
To add the user control to your web page, you must add the Register directive and an instance of
the user control to the page. The following code shows the content file:
Inherits="customcontroldemo.footer" %>
 <%@ Control Language="C#" AutoEventWireup="true" CodeBehind="footer.ascx.cs"
</table>
<tr>
<td align="center"> Location: Hyderabad, A.P </td>
</tr>
<table>
<tr>
<td align="center"> Copyright ©2010 TutorialPoints Ltd.</td>
</tr>








Inherits="customcontroldemo._Default" %>
<%@ Register Src="~/footer.ascx" TagName="footer" TagPrefix="Tfooter" %>
<title>
Untitled Page

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When executed, the page shows the footer and this control could be used in all the pages of your
website.
(1) The Register directive specifies a tag name as well as tag prefix for the control.
(2) The following tag name and prefix should be used while adding the user control on the page:
Custom Controls
Custom controls are deployed as individual assemblies. They are compiled into a Dynamic Link
Library (DLL) and used as any other ASP.NET server control. They could be created in either of
the following way:
 By deriving a custom control from an existing control
 By composing a new custom control combing two or more existing controls.
 By deriving from the base control class.
</title>
</head>
<body>
<div>
<asp:Label ID="Label1" runat="server" Text="Welcome to ASP.Net Tutorials
"></asp:Label>
<br /> <br />
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Copyright
Info" />
</div>
<Tfooter:footer ID="footer1" runat="server" />
</form>
</body>
</html>
<%@ Register Src="~/footer.ascx" TagName="footer" TagPrefix="Tfooter" %>
<Tfooter:footer ID="footer1" runat="server" />

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To understand the concept, let us create a custom control, which will simply render a text message
on the browser. To create this control, take the following steps:
Create a new website. Right click the solution (not the project) at the top of the tree in the Solution
Explorer.
In the New Project dialog box, select ASP.NET Server Control from the project templates.
The above step adds a new project and creates a complete custom control to the solution, called
ServerControl1. In this example, let us name the project CustomControls. To use this control,
this must be added as a reference to the web site before registering it on a page. To add a reference
to the existing project, right click on the project (not the solution), and click Add Reference.
Select the CustomControls project from the Projects tab of the Add Reference dialog box. The
Solution Explorer should show the reference.

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To use the control on a page, add the Register directive just below the @Page directive:
Further, you can use the control, similar to any other controls.
When executed, the Text property of the control is rendered on the browser as shown:
Working with Custom Controls
In the previous example, the value for the Text property of the custom control was set. ASP.NET
added this property by default, when the control was created. The following code behind file of
the control reveals this.
<%@ Register Assembly="CustomControls" Namespace="CustomControls" TagPrefix="ccs"
%>
<div>
<ccs:ServerControl1 runat="server" Text = "I am a Custom Server Control" />
</div>
</form>
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Web;
namespace CustomControls
{
[DefaultProperty("Text")]
[ToolboxData("<{0}:ServerControl1 runat=server></{0}:ServerControl1 >")]

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The above code is automatically generated for a custom control. Events and methods could be
added to the custom control class.
Example
Let us expand the previous custom control named SeverControl1. Let us give it a method named
checkpalindrome, which gives it a power to check for palindromes.
Palindromes are words/literals that spell the same when reversed. For example, Malayalam,
madam, saras, etc.
Extend the code for the custom control, which should look as:
public class ServerControl1 : WebControl
{
[Bindable(true)]
[Category("Appearance")]
[DefaultValue("")]
[Localizable(true)]
public string Text
{
get
{
String s = (String)ViewState["Text"];
return ((s == null) ? "[" + this.ID + "]" : s);
}
set
{
ViewState["Text"] = value;
}
}
protected override void RenderContents(HtmlTextWriter output)
{
output.Write(Text);
}
}
}
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Web;

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namespace CustomControls
{
[DefaultProperty("Text")]
[ToolboxData("<{0}:ServerControl1 runat=server></{0}:ServerControl1 >")]
public class ServerControl1 : WebControl
{
[Bindable(true)]
[Category("Appearance")]
[DefaultValue("")]
[Localizable(true)]
public string Text
{
get
{
String s = (String)ViewState["Text"];
return ((s == null) ? "[" + this.ID + "]" : s);
}
set
{
ViewState["Text"] = value;
}
}
protected override void RenderContents(HtmlTextWriter output)
{
if (this.checkpanlindrome())
{
output.Write("This is a palindrome: <br />");
output.Write("<FONT size=5 color=Blue>");
output.Write("<B>");
output.Write(Text);
output.Write("</B>");
output.Write("</FONT>");
}
else
{
output.Write("This is not a palindrome: <br />");
output.Write("<FONT size=5 color=red>");
output.Write("<B>");
output.Write(Text);
output.Write("</B>");
output.Write("</FONT>");

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When you change the code for the control, you must build the solution by clicking Build --> Build
Solution, so that the changes are reflected in your project. Add a text box and a button control to
the page, so that the user can provide a text, it is checked for palindrome, when the button is
clicked.
}
}
protected bool checkpanlindrome()
{
if (this.Text != null)
{
String str = this.Text;
String strtoupper = Text.ToUpper();
char[] rev = strtoupper.ToCharArray();
Array.Reverse(rev);
String strrev = new String(rev);
if (strtoupper == strrev)
{
return true;
}
else
{
return false;
}
}
else
{
return false;
}
}
}
}
<div>
Enter a word:
<br />
<asp:TextBox ID="TextBox1" runat="server" style="width:198px"> </asp:TextBox>
<br /> <br />
<asp:Button ID="Button1" runat="server onclick="Button1_Click" Text="Check
Palindrome" style="width:132px" />
<br /> <br />

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The Click event handler for the button simply copies the text from the text box to the text
property of the custom control.
When executed, the control successfully checks palindromes.
(1) When you add a reference to the custom control, it is added to the toolbox and you can
directly use it from the toolbox similar to any other control.
(2) The RenderContents method of the custom control class is overridden here, as you can add
your own methods and events.
(3) The RenderContents method takes a parameter of HtmlTextWriter type, which is responsible
for rendering on the browser.
<ccs:ServerControl1 ID="ServerControl11" runat="server" Text = "" />
</div>
</form>
{
this.ServerControl11.Text = this.TextBox1.Text;
}

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ADO.NET
ADO.NET provides a bridge between the front end controls and the back end database. The
ADO.NET objects encapsulate all the data access operations and the controls interact with these
objects to display data, thus hiding the details of movement of data.
The following figure shows the ADO.NET objects at a glance:
The DataSet Class
The dataset represents a subset of the database. It does not have a continuous connection to the
database. To update the database a reconnection is required. The DataSet contains DataTable
objects and DataRelation objects. The DataRelation objects represent the relationship between two
tables.
Following table shows some important properties of the DataSet class:
CaseSensitive Indicates whether string comparisons within the data tables
are case-sensitive.
Container Gets the container for the component.
DataSetName Gets or sets the name of the current data set.
DefaultViewManager Returns a view of data in the data set.

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DesignMode Indicates whether the component is currently in design mode.
EnforceConstraints Indicates whether constraint rules are followed when
attempting any update operation.
Events Gets the list of event handlers that are attached to this
component.
ExtendedProperties Gets the collection of customized user information associated
with the DataSet.
HasErrors Indicates if there are any errors.
IsInitialized Indicates whether the DataSet is initialized.
Locale Gets or sets the locale information used to compare strings
within the table.
Namespace Gets or sets the namespace of the DataSet.
Prefix Gets or sets an XML prefix that aliases the namespace of the
DataSet.
Relations Returns the collection of DataRelation objects.
Tables Returns the collection of DataTable objects.
The following table shows some important methods of the DataSet class:
Methods Description
AcceptChanges Accepts all changes made since the DataSet was loaded or
this method was called.
BeginInit Begins the initialization of the DataSet. The initialization
occurs at run time.
Clear Clears data.
Clone Copies the structure of the DataSet, including all DataTable

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schemas, relations, and constraints. Does not copy any data.
Copy Copies both structure and data.
CreateDataReader() Returns a DataTableReader with one result set per DataTable,
in the same sequence as the tables appear in the Tables
collection.
CreateDataReader(DataTable[]) Returns a DataTableReader with one result set per DataTable.
EndInit Ends the initialization of the data set.
Equals(Object) Determines whether the specified Object is equal to the
current Object.
Finalize Free resources and perform other cleanups.
GetChanges Returns a copy of the DataSet with all changes made since it
was loaded or the AcceptChanges method was called.
GetChanges(DataRowState) Gets a copy of DataSet with all changes made since it was
loaded or the AcceptChanges method was called, filtered by
DataRowState.
GetDataSetSchema Gets a copy of XmlSchemaSet for the DataSet.
GetObjectData Populates a serialization information object with the data
needed to serialize the DataSet.
GetXML Returns the XML representation of the data.
GetXMLSchema Returns the XSD schema for the XML representation of the

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data.
HasChanges() Gets a value indicating whether the DataSet has changes,
including new, deleted, or modified rows.
HasChanges(DataRowState) Gets a value indicating whether the DataSet has changes,
including new, deleted, or modified rows, filtered by
DataRowState.
IsBinarySerialized Inspects the format of the serialized representation of the
DataSet.
Load(IDataReader, LoadOption,
DataTable[])
Fills a DataSet with values from a data source using the
supplied IDataReader, using an array of DataTable instances
to supply the schema and namespace information.
Load(IDataReader, LoadOption,
String[])
Fills a DataSet with values from a data source using the
supplied IDataReader, using an array of strings to supply the
names for the tables within the DataSet.
Merge() Merges the data with data from another DataSet. This method
has different overloaded forms.
ReadXML() Reads an XML schema and data into the DataSet. This
method has different overloaded forms.
ReadXMLSchema(0) Reads an XML schema into the DataSet. This method has
different overloaded forms.
RejectChanges Rolls back all changes made since the last call to
AcceptChanges.
WriteXML() Writes an XML schema and data from the DataSet. This

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WriteXMLSchema() Writes the structure of the DataSet as an XML schema. This
The DataTable Class
The DataTable class represents the tables in the database. It has the following important
properties; most of these properties are read only properties except the PrimaryKey property:
ChildRelations Returns the collection of child relationship.
Columns Returns the Columns collection.
Constraints Returns the Constraints collection.
DataSet Returns the parent DataSet.
DefaultView Returns a view of the table.
ParentRelations Returns the ParentRelations collection.
PrimaryKey Gets or sets an array of columns as the primary key for the
table.
Rows Returns the Rows collection.
The following table shows some important methods of the DataTable class:
Methods Description
AcceptChanges Commits all changes since the last AcceptChanges.
Clear Clears all data from the table.

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GetChanges Returns a copy of the DataTable with all changes made since
the AcceptChanges method was called.
GetErrors Returns an array of rows with errors.
ImportRows Copies a new row into the table.
LoadDataRow Finds and updates a specific row, or creates a new one, if not
found any.
Merge Merges the table with another DataTable.
NewRow Creates a new DataRow.
AcceptChanges.
Reset Resets the table to its original state.
Select Returns an array of DataRow objects.
The DataRow Class
The DataRow object represents a row in a table. It has the following important properties:
HasErrors Indicates if there are any errors.
Items Gets or sets the data stored in a specific column.
ItemArrays Gets or sets all the values for the row.
Table Returns the parent table.
The following table shows some important methods of the DataRow class:
Methods Description
AcceptChanges Accepts all changes made since this method was called.
BeginEdit Begins edit operation.

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CancelEdit Cancels edit operation.
Delete Deletes the DataRow.
EndEdit Ends the edit operation.
GetChildRows Gets the child rows of this row.
GetParentRow Gets the parent row.
GetParentRows Gets parent rows of DataRow object.
The DataAdapter Object
The DataAdapter object acts as a mediator between the DataSet object and the database. This helps
the Dataset to contain data from multiple databases or other data source.
The DataReader Object
The DataReader object is an alternative to the DataSet and DataAdapter combination. This object
provides a connection oriented access to the data records in the database. These objects are suitable
for read-only access, such as populating a list and then breaking the connection.
DbCommand and DbConnection Objects
The DbConnection object represents a connection to the data source. The connection could be
shared among different command objects.
The DbCommand object represents the command or a stored procedure sent to the database from
retrieving or manipulating data.
Example
So far, we have used tables and databases already existing in our computer. In this example, we
will create a table, add column, rows and data into it and display the table using a GridView object.
The source file code is as given:
Inherits="createdatabase._Default" %>
<title>
Untitled Page
</title>

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The code behind file is as given:
</head>
<body>
<div>
<asp:GridView ID="GridView1" runat="server">
</asp:GridView>
</div>
</form>
</body>
</html>
namespace createdatabase
{
{
{
if (!IsPostBack)
{
DataSet ds = CreateDataSet();
GridView1.DataSource = ds.Tables["Student"];
GridView1.DataBind();
}
}
private DataSet CreateDataSet()
{
//creating a DataSet object for tables
DataSet dataset = new DataSet();
// creating the student table
DataTable Students = CreateStudentTable();
dataset.Tables.Add(Students);
return dataset;
}
private DataTable CreateStudentTable()
{
DataTable Students = new DataTable("Student");
// adding columns
AddNewColumn(Students, "System.Int32", "StudentID");

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When you execute the program, observe the following:
 The application first creates a data set and binds it with the grid view control using the
DataBind() method of the GridView control.
 The Createdataset() method is a user defined function, which creates a new DataSet object
and then calls another user defined method CreateStudentTable() to create the table and
add it to the Tables collection of the data set.
 The CreateStudentTable() method calls the user defined methods AddNewColumn() and
AddNewRow() to create the columns and rows of the table as well as to add data to the
rows.
When the page is executed, it returns the rows of the table as shown:
AddNewColumn(Students, "System.String", "StudentName");
AddNewColumn(Students, "System.String", "StudentCity");
// adding rows
AddNewRow(Students, 1, "M H Kabir", "Kolkata");
AddNewRow(Students, 1, "Shreya Sharma", "Delhi");
AddNewRow(Students, 1, "Rini Mukherjee", "Hyderabad");
AddNewRow(Students, 1, "Sunil Dubey", "Bikaner");
AddNewRow(Students, 1, "Rajat Mishra", "Patna");
return Students;
}
private void AddNewColumn(DataTable table, string columnType, string columnName)
{
DataColumn column = table.Columns.Add(columnName, Type.GetType(columnType));
}
//adding data into the table
private void AddNewRow(DataTable table, int id, string name, string city)
{
DataRow newrow = table.NewRow();
newrow["StudentID"] = id;
newrow["StudentName"] = name;
newrow["StudentCity"] = city;
table.Rows.Add(newrow);
}
}
}

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ASP.NET - Error Handling
Error handling in ASP.NET has three aspects:

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 Tracing - tracing the program execution at page level or application level.
 Error handling - handling standard errors or custom errors at page level or application
level.
 Debugging - stepping through the program, setting break points to analyze the code
In this chapter, we will discuss tracing and error handling and in this chapter, we will discuss
debugging.
To understand the concepts, create the following sample application. It has a label control, a
dropdown list, and a link. The dropdown list loads an array list of famous quotes and the selected
quote is shown in the label below. It also has a hyperlink which has points to a nonexistent link.
Inherits="errorhandling._Default" %>
<title>
Tracing, debugging and error handling
</title>
</head>
<body>
<div>
<asp:Label ID="lblheading" runat="server" Text="Tracing, Debuggin and Error
Handling">
</asp:Label>
<br /> <br />
<asp:DropDownList ID="ddlquotes" runat="server" AutoPostBack="True"
onselectedindexchanged="ddlquotes_SelectedIndexChanged">
</asp:DropDownList>
<br /> <br />
<asp:Label ID="lblquotes" runat="server">
</asp:Label>
<br /> <br />
<asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl="mylink.htm">Link
to:</asp:HyperLink>

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The code behind file:
Tracing
To enable page level tracing, you need to modify the Page directive and add a Trace attribute as
shown:
Now when you execute the file, you get the tracing information:
</div>
</form>
</body>
</html>
{
{
if (!IsPostBack)
{
string[,] quotes =
{
{"Imagination is more important than Knowledge.", "Albert Einsten"},
{"Assume a virtue, if you have it not" "Shakespeare"},
{"A man cannot be comfortable without his own approval", "Mark Twain"},
{"Beware the young doctor and the old barber", "Benjamin Franklin"},
{"Whatever begun in anger ends in shame", "Benjamin Franklin"}
};
for (int i=0; i<quotes.GetLength(0); i++)
ddlquotes.Items.Add(new ListItem(quotes[i,0], quotes[i,1]));
}
}
protected void ddlquotes_SelectedIndexChanged(object sender, EventArgs e)
{
if (ddlquotes.SelectedIndex != -1)
{
lblquotes.Text = String.Format("{0}, Quote: {1}", ddlquotes.SelectedItem.Text,
ddlquotes.SelectedValue);
}
}
}
Inherits="errorhandling._Default" Trace ="true" %>

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It provides the following information at the top:
 Session ID
 Status Code
 Time of Request
 Type of Request
 Request and Response Encoding
The status code sent from the server, each time the page is requested shows the name and time of
error if any. The following table shows the common HTTP status codes:
Number Description
Informational (100 - 199)
100 Continue
101 Switching protocols
Successful (200 - 299)
200 OK
204 No content
Redirection (300 - 399)
301 Moved permanently
305 Use proxy
307 Temporary redirect
Client Errors (400 - 499)
400 Bad request
402 Payment required
404 Not found

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408 Request timeout
417 Expectation failed
Server Errors (500 - 599)
500 Internal server error
503 Service unavailable
505 HTTP version not supported
Under the top level information, there is Trace log, which provides details of page life cycle. It
provides elapsed time in seconds since the page was initialized.
The next section is control tree, which lists all controls on the page in a hierarchical manner:
Last in the Session and Application state summaries, cookies, and headers collections followed
by list of all server variables.
The Trace object allows you to add custom information to the trace output. It has two methods to
accomplish this: the Write method and the Warn method.

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Change the Page_Load event handler to check the Write method:
Run to observe the effects:
To check the Warn method, let us forcibly enter some erroneous code in the selected index
changed event handler:
Try-Catch is a C# programming construct. The try block holds any code that may or may not
produce error and the catch block catches the error. When the program is run, it sends the warning
in the trace log.
Application level tracing applies to all the pages in the web site. It is implemented by putting the
following code lines in the web.config file:
{
Trace.Write("Page Load");
if (!IsPostBack)
{
Trace.Write("Not Post Back, Page Load");
string[,] quotes =
.......................
}
}
try
{
int a = 0;
int b = 9 / a;
}catch (Exception e)
{
Trace.Warn("UserAction", "processing 9/a", e);
}
<system.web>
<trace enabled="true" />

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Error Handling
Although ASP.NET can detect all runtime errors, still some subtle errors may still be there.
Observing the errors by tracing is meant for the developers, not for the users.
Hence, to intercept such occurrence, you can add error handing settings in the web.config file of
the application. It is application-wide error handling. For example, you can add the following lines
in the web.config file:
The <customErrors> section has the possible attributes:
 Mode : It enables or disables custom error pages. It has the three possible values:
o On : displays the custom pages.
o Off : displays ASP.NET error pages (yellow pages)
o remoteOnly : It displays custom errors to client, display ASP.NET errors locally.
 defaultRedirect : It contains the URL of the page to be displayed in case of unhandled
errors.
To put different custom error pages for different type of errors, the <error> sub tags are used,
where different error pages are specified, based on the status code of the errors.
To implement page level error handling, the Page directive could be modified:
</system.web>
<configuration>
<system.web>
<customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm">
<error statusCode="403" redirect="NoAccess.htm"/>
<error statusCode="404" redirect="FileNotFound.htm" />
</customErrors>
</system.web>
<configuration>
Inherits="errorhandling._Default" Trace ="true" ErrorPage="PageError.htm" %>

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ASP.NET – Security
Implementing security in a site has the following aspects:
 Authentication : It is the process of ensuring the user's identity and authenticity.
ASP.NET allows four types of authentications:
o Windows Authentication
o Forms Authentication
o Passport Authentication
o Custom Authentication
 Authorization : It is the process of defining and allotting specific roles to specific users.
 Confidentiality : It involves encrypting the channel between the client browser and the
web server.
 Integrity : It involves maintaining the integrity of data. For example, implementing
digital signature.

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Forms-Based Authentication
Traditionally, forms-based authentication involves editing the web.config file and adding a login
page with appropriate authentication code.
The web.config file could be edited and the following codes written on it:
The login.aspx page mentioned in the above code snippet could have the following code behind
file with the usernames and passwords for authentication hard coded into it.
<configuration>
<system.web>
<authentication mode="Forms">
<forms loginUrl ="login.aspx"/>
</authentication>
<authorization>
<deny users="?"/>
</authorization>
</system.web>
...
...
</configuration>
protected bool authenticate(String uname, String pass)
{
if(uname == "Tom")
{
if(pass == "tom123")
return true;
}
if(uname == "Dick")
{
if(pass == "dick123")
return true;
}
if(uname == "Harry")
{
if(pass == "har123")
return true;
}
return false;
}
public void OnLogin(Object src, EventArgs e)

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Observe that the FormsAuthentication class is responsible for the process of authentication.
However, Visual Studio allows you to implement user creation, authentication, and authorization
with seamless ease without writing any code, through the Web Site Administration tool. This
tool allows creating users and roles.
Apart from this, ASP.NET comes with readymade login controls set, which has controls
performing all the jobs for you.
Implementing Forms-Based Security
To set up forms-based authentication, you need the following:
 A database of users to support the authentication process
 A website that uses the database
 User accounts
 Roles
 Restriction of users and group activities
 A default page, to display the login status of the users and other information.
 A login page, to allow users to log in, retrieve password, or change password
To create users, take the following steps:
Step (1) : Choose Website -> ASP.NET Configuration to open the Web Application
Administration Tool.
Step (2) : Click on the Security tab.
{
if (authenticate(txtuser.Text, txtpwd.Text))
{
FormsAuthentication.RedirectFromLoginPage(txtuser.Text, chkrem.Checked);
}
else
{
Response.Write("Invalid user name or password");
}
}

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Step (3) : Select the authentication type to 'Forms based authentication' by selecting the 'From
the Internet' radio button.
Step (4) : Click on 'Create Users' link to create some users. If you already had created roles, you
could assign roles to the user, right at this stage.

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Step (5) : Create a web site and add the following pages:
 Welcome.aspx
 Login.aspx
 CreateAccount.aspx
 PasswordRecovery.aspx
 ChangePassword.aspx
Step (6) : Place a LoginStatus control on the Welcome.aspx from the login section of the
toolbox. It has two templates: LoggedIn and LoggedOut.
In LoggedOut template, there is a login link and in the LoggedIn template, there is a logout link
on the control. You can change the login and logout text properties of the control from the
Properties window.
Step (7) : Place a LoginView control from the toolbox below the LoginStatus control. Here, you
can put texts and other controls (hyperlinks, buttons etc.), which are displayed based on whether
the user is logged in or not.
This control has two view templates: Anonymous template and LoggedIn template. Select each
view and write some text for the users to be displayed for each template. The text should be placed
on the area marked red.

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Step (8) : The users for the application are created by the developer. You might want to allow a
visitor to create a user account. For this, add a link beneath the LoginView control, which should
link to the CreateAccount.aspx page.
Step (9) : Place a CreateUserWizard control on the create account page. Set the
ContinueDestinationPageUrl property of this control to Welcome.aspx.
Step (10) : Create the Login page. Place a Login control on the page. The LoginStatus control
automatically links to the Login.aspx. To change this default, make the following changes in the
web.config file.
For example, if you want to name your log in page as signup.aspx, add the following lines to the
<authentication> section of the web.config:
Step (11) : Users often forget passwords. The PasswordRecovery control helps the user gain access
to the account. Select the Login control. Open its smart tag and click 'Convert to Template'.
<configuration>
<system.web>
<authentication mode="Forms">
<forms loginUrl ="signup.aspx" defaultUrl = â€œWelcome.aspxâ€• />
</authentication>
</system.web>
</configuration>

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Customize the UI of the control to place a hyperlink control under the login button, which should
link to the PassWordRecovery.aspx.
Step (12) : Place a PasswordRecovery control on the password recovery page. This control needs
an email server to send the passwords to the users.
Step (13) : Create a link to the ChangePassword.aspx page in the LoggedIn template of the
LoginView control in Welcome.aspx.
Step (14) : Place a ChangePassword control on the change password page. This control also has
two views.

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Now run the application and observe different security operations.
To create roles, go back to the Web Application Administration Tools and click on the Security
tab. Click on 'Create Roles' and create some roles for the application.
Click on the 'Manage Users' link and assign roles to the users.
IIS Authentication: SSL
The Secure Socket Layer or SSL is the protocol used to ensure a secure connection. With SSL
enabled, the browser encrypts all data sent to the server and decrypts all data coming from the
server. At the same time, the server encrypts and decrypts all data to and from browser.
The URL for a secure connection starts with HTTPS instead of HTTP. A small lock is displayed
by a browser using a secure connection. When a browser makes an initial attempt to

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communicate with a server over a secure connection using SSL, the server authenticates itself by
sending its digital certificate.
To use the SSL, you need to buy a digital secure certificate from a trusted Certification Authority
(CA) and install it in the web server. Following are some of the trusted and reputed certification
authorities:
 www.verisign.com
 www.geotrust.com
 www.thawte.com
SSL is built into all major browsers and servers. To enable SSL, you need to install the digital
certificate. The strength of various digital certificates varies depending upon the length of the
key generated during encryption. More the length, more secure is the certificate, hence the
connection.
Strength Description
40 bit Supported by most browsers but easy to break.
56 bit Stronger than 40-bit.
128 bit Extremely difficult to break but all the browsers do not
support it.
ASP.NET - Data Caching

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What is Caching?
Caching is a technique of storing frequently used data/information in memory, so that, when the
same data/information is needed next time, it could be directly retrieved from the memory
instead of being generated by the application.
Caching is extremely important for performance boosting in ASP.NET, as the pages and controls
are dynamically generated here. It is especially important for data related transactions, as these are
expensive in terms of response time.
Caching places frequently used data in quickly accessed media such as the random access memory
of the computer. The ASP.NET runtime includes a key-value map of CLR objectscalled
cache. This resides with the application and is available via the HttpContext and
System.Web.UI.Page.
In some respect, caching is similar to storing the state objects. However, the storing information
in state objects is deterministic, i.e., you can count on the data being stored there, and caching of
data is nondeterministic.
The data will not be available in the following cases:
 If its lifetime expires,
 If the application releases its memory,
 If caching does not take place for some reason.
You can access items in the cache using an indexer and may control the lifetime of objects in the
cache and set up links between the cached objects and their physical sources.
Caching in ASP.Net
ASP.NET provides the following different types of caching:
 Output Caching : Output cache stores a copy of the finally rendered HTML pages or part
of pages sent to the client. When the next client requests for this page, instead of
regenerating the page, a cached copy of the page is sent, thus saving time.
 Data Caching : Data caching means caching data from a data source. As long as the
cache is not expired, a request for the data will be fulfilled from the cache. When the cache
is expired, fresh data is obtained by the data source and the cache is refilled.
 Object Caching : Object caching is caching the objects on a page, such as data-bound
controls. The cached data is stored in server memory.
 Class Caching : Web pages or web services are compiled into a page class in theassembly,
when run for the first time. Then the assembly is cached in the server. Next time when
a request is made for the page or service, the cached assembly is referred to. When the
source code is changed, the CLR recompiles the assembly.
 Configuration Caching : Application wide configuration information is stored in a
configuration file. Configuration caching stores the configuration information in the server
memory.
Now, we will consider output caching, data caching, and object caching.

123 | P a g e
Output Caching
Rendering a page may involve some complex processes such as, database access, rendering
complex controls etc. Output caching allows bypassing the round trips to server by caching data
in memory. Even the whole page could be cached.
The OutputCache directive is responsible of output caching. It enables output caching and provides
certain control over its behaviour.
Syntax for OutputCache directive:
Put this directive under the page directive. This tells the environment to cache the page for 15
seconds. The following event handler for page load would help in testing that the page was really
cached.
The Thread.Sleep() method stops the process thread for the specified time. In this example, the
thread is stopped for 10 seconds, so when the page is loaded for first time, it takes 10 seconds.
However, next time you refresh the page it does not take any time, as the page is retrieved from
the cache without being loaded.
The OutputCache directive has the following attributes, which helps in controlling the behaviour
of the output cache:
Attribute Values Description
DiskCacheable true/false Specifies that output could be written to a disk based cache.
NoStore true/false Specifies that the "no store" cache control header is sent or not.
CacheProfile String name Name of a cache profile as to be stored in web.config.
VaryByParam
None
*
Param- name
Semicolon delimited list of string specifies query string values
in a GET request or variable in a POST request.
<%@ OutputCache Duration="15" VaryByParam="None" %>
{
Thread.Sleep(10000);
Response.Write("This page was generated and cache at:" +
DateTime.Now.ToString());
}

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VaryByHeader
*
Header
names
Semicolon delimited list of strings specifies headers that might
be submitted by a client.
VaryByCustom
Browser
Custom
string
Tells ASP.NET to vary the output cache by browser name and
version or by a custom string.
Location
Any
Client
Downstream
Server
None
Any: page may be cached anywhere.
Client: cached content remains at browser.
Downstream: cached content stored in downstream and server
both.
Server: cached content saved only on server.
None: disables caching.
Duration Number Number of seconds the page or control is cached.
Let us add a text box and a button to the previous example and add this event handler for the
button.
Change the OutputCache directive:
When the program is executed, ASP.NET caches the page on the basis of the name in the text box.
Data Caching
The main aspect of data caching is caching the data source controls. We have already discussed
that the data source controls represent data in a data source, like a database or an XML file.
These controls derive from the abstract class DataSourceControl and have the following inherited
properties for implementing caching:
 CacheDuration - It sets the number of seconds for which the data source will cache data.
protected void btnmagic_Click(object sender, EventArgs e)
{
Response.Write("<br><br>");
Response.Write("<h2> Hello, " + this.txtname.Text + "</h2>");
}
<%@ OutputCache Duration="60" VaryByParam="txtname" %>

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 CacheExpirationPolicy - It defines the cache behavior when the data in cache has
expired.
 CacheKeyDependency - It identifies a key for the controls that auto-expires the content
of its cache when removed.
 EnableCaching - It specifies whether or not to cache the data.
Example
To demonstrate data caching, create a new website and add a new web form on it. Add a
SqlDataSource control with the database connection already used in the data access tutorials.
For this example, add a label to the page, which would show the response time for the page.
Apart from the label, the content page is same as in the data access tutorial. Add an event handler
for the page load event:
The designed page should look as shown:
When you execute the page for the first time, nothing different happens, the label shows that, each
time you refresh the page, the page is reloaded and the time shown on the label changes.
Next, set the EnableCaching attribute of the data source control to be 'true' and set the
Cacheduration attribute to '60'. It will implement caching and the cache will expire every 60
seconds.
The timestamp changes with every refresh, but if you change the data in the table within these 60
seconds, it is not shown before the cache expires.
<asp:Label ID="lbltime" runat="server"></asp:Label>
{
lbltime.Text = String.Format("Page posted at: {0}", DateTime.Now.ToLongTimeString());
}
<asp:SqlDataSource ID = "SqlDataSource1" runat = "server"
ConnectionString = "<%$ ConnectionStrings: ASPDotNetStepByStepConnectionString %>"

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Object Caching
Object caching provides more flexibility than other cache techniques. You can use object caching
to place any object in the cache. The object can be of any type - a data type, a web control, a class,
a dataset object, etc. The item is added to the cache simply by assigning a new key name, shown
as follows Like:
ASP.NET also provides the Insert() method for inserting an object to the cache. This method has
four overloaded versions. Let us see them:
Overload Description
Cache.Insert((key, value); Inserts an item into the cache with the key name and
value with default priority and expiration.
Cache.Insert(key, value, dependencies); Inserts an item into the cache with key, value, default
priority, expiration and a CacheDependency name that
links to other files or items so that when these change
the cache item remains no longer valid.
Cache.Insert(key, value, dependencies,
absoluteExpiration, slidingExpiration);
This indicates an expiration policy along with the
above issues.
Cache.Insert(key, value, dependencies,
absoluteExpiration, slidingExpiration,
priority, onRemoveCallback);
This along with the parameters also allows you to set a
priority for the cache item and a delegate that, points
to a method to be invoked when the item is removed.
Sliding expiration is used to remove an item from the cache when it is not used for the specified
time span. The following code snippet stores an item with a sliding expiration of 10 minutes with
no dependencies.
Example
Create a page with just a button and a label. Write the following code in the page load event:
ProviderName = "<%$ ConnectionStrings:
ASPDotNetStepByStepConnectionString.ProviderName %>"
SelectCommand = "SELECT * FROM [DotNetReferences]"
EnableCaching = "true" CacheDuration = "60">
</asp:SqlDataSource>
Cache["key"] = item;
Cache.Insert("my_item", obj, null, DateTime.MaxValue, TimeSpan.FromMinutes(10));

127 | P a g e
When the page is loaded for the first time, it says:
Page Created.
Creating test item.
Storing test item in cache for 30 seconds.
If you click on the button again within 30 seconds, the page is posted back but the label control
gets its information from the cache as shown:
Page Posted Back.
Retrieving test item.
Test item is: 14-07-2010 01:25:04
{
if (this.IsPostBack)
{
lblinfo.Text += "Page Posted Back.<br/>";
}
else
{
lblinfo.Text += "page Created.<br/>";
}
if (Cache["testitem"] == null)
{
lblinfo.Text += "Creating test item.<br/>";
DateTime testItem = DateTime.Now;
lblinfo.Text += "Storing test item in cache ";
lblinfo.Text += "for 30 seconds.<br/>";
Cache.Insert("testitem", testItem, null,
DateTime.Now.AddSeconds(30), TimeSpan.Zero);
}
else
{
lblinfo.Text += "Retrieving test item.<br/>";
DateTime testItem = (DateTime)Cache["testitem"];
lblinfo.Text += "Test item is: " + testItem.ToString();
lblinfo.Text += "<br/>";
}
lblinfo.Text += "<br/>";
}

128 | P a g e
References
1. Kamal Acharya. School management system project report. Authorea. August
01, 2024.
DOI: https://doi.org/10.22541/au.172254873.34023165/v1
2. Kamal Acharya. A CASE STUDY OF CINEMA MANAGEMENT SYSTEM
PROJECT. Authorea. August 01, 2024.
3. Kamal Acharya. A CASE STUDY ON ONLINE TICKET BOOKING SYSTEM
PROJECT. Authorea. August 01, 2024.
4. Kamal Acharya. Web chatting application project report management
system. Authorea. August 01, 2024.
5. Kamal Acharya. RETAIL STORE MANAGEMENT SYSTEM PROJECT
REPORT. Authorea. August 01, 2024.
6. Kamal Acharya. SUPERMARKET MANAGEMENT SYSTEM PROJECT
7. Kamal Acharya. SOCIAL MEDIA MANAGEMENT SYSTEM PROJECT
8. Kamal Acharya. Online music portal management system project
report. Authorea. August 01, 2024.
9. Kamal Acharya. COLLEGE BUS MANAGEMENT SYSTEM PROJECT
REPORT. Authorea. July 31, 2024.
10. Kamal Acharya. AUTOMOBILE MANAGEMENT SYSTEM PROJECT
REPORT. Authorea. July 31, 2024.
11. Kamal Acharya. Ludo management system project report. Authorea. July 31,
2024.DOI: https://doi.org/10.22541/au.172243999.98091616/v1
12. Kamal Acharya. Literature online quiz system project report. Authorea. July 31,
2024. DOI: https://doi.org/10.22541/au.172243825.53562953/v1
13. Kamal Acharya. Avoid waste management system project. Authorea. July 29,
2024. DOI: https://doi.org/10.22541/au.172228528.85022205/v1

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