Database connectivity to sql server asp.net

DATABASE
CONNECTIVITY
Programming : C#
Technology : Asp.net
Database : MS Sql Server
Author : Hemant Sankhla (Web Developer)

I will teach you how to connect MS Sql Server
Database to an Asp.Net Web Application using C#.
After the successful connection you are able to
perform various operations on database from your
web application like select, insert, update, delete etc.
Lets check it out and do yourself.

First of all Create Database in MS Sql Server
1. Go to Database > Right Click > New Database. And give a
name to your Database.
2. Now Create a table in this database. To do such select the
database > Right click On Table > New Table. Now enter
desired fields and save it using ctrl + s.
Now your database with tables is ready to be a part of your
web application.

Create The Connection String (Path to server and database)
Connection string means the address to the Sql Server and The database using the
security access, or if there is an username and password then providing these
credentials for accessing the server and database.
Now type below line in ‘web.config’ file which you have in your website directory,
search for it in Solution Explorer. If we make connection in ‘web.config’ file then we
only have to make it once and we call it where we want it.
<connectionStrings>
<add name = "con" connectionString="Data Source=.sqlexpress ;
Initial Catalog=Database; Integrated Security=true"/>
</connectionStrings>

Create The Connection String (Path to server and database)
name : The name of your connection
ConnectionString : The full path or address to your server and database
DataSource : Sql Server Name (you can get this in Sql server management studio.
Copy the server name from the connection dialog box at starting.)
Initial Catalog : Your Database.
Integrated Security : True, use this if you have no username and password in sql
server.

Using NameSpaces
Namespace is a collection of classes and methods. In C# various
namespaces are used in different work. Here we want to connect and use
the Sql Server so we have to use appropriate namespaces for this task.
Namespaces are used by the ‘Using keyword.’
Add these two name spaces.
using System.Data;
using System.Data.SqlClient;

Using NameSpaces
Namespace is a collection of classes and methods. In C# various
namespaces are used in different work. Here we want to connect and use
the Sql Server so we have to use appropriate namespaces for this task.
Namespaces are used by the ‘Using keyword.’
Add these two name spaces.
using System.Data;
using System.Data.SqlClient;
using System.Web.Configuration;

The Essential Code
Below is the essential code for all type of operation.
SqlConnection con = new SqlConnection
(WebConfigurationManager.ConnectionStrings["con"].ToString( ));
con.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;

Understanding The Code
SqlConnection : This class creates a connection object. Con is the object
for connection.
WebConfigurationManager : This class fetch the connection string from
the web.config file.
Con.open( ) : Open the current connection.
SqlCommand : Create the Sql command Query’s object.
Cmd.connection = con : Supply the con object to the cmd connection.

Select All
SqlConnection con = new
SqlConnection(WebConfigurationManager.ConnectionStrings["con"].ToStrin
g());
con.Open();
cmd.CommandText = "select * from Table ";
SqlDataAdapter da = new SqlDataAdapter();
DataSet ds = new DataSet();
da.SelectCommand = cmd;
da.Fill(ds);

Insert Into
SqlConnection(WebConfigurationManager.ConnectionStrings["con"].ToString());
con.Open();
cmd.CommandText = "insert into Student (FullName, Marks) values ('" +
txtName.Text + "','" + txtMarks.Text + "')";
int h = cmd.ExecuteNonQuery();
if (h > 0)
{
Response.Write("Inserted Successfully");
}

Update Record
con.Open();
cmd.CommandText = “update Student SET FullName = '" + txtName.Text + "',
Marks = '" + txtMarks.Text + “’ where ID = ID;
if (h > 0)
{
Response.Write(“Record Updated Successfully");
}

Delete Record
con.Open();
cmd.CommandText = “delete from Student where ID =‘ ” + ID + “ ‘;
if (h > 0)
{
Response.Write(“Record Deleted Successfully");
}

Now you have to practice those codes by hand. If you feel any trouble comment me
These codes also work well in C# Windows Desktop Application.

Database connectivity to sql server asp.net

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