Constantin Lista

Scoped vs. Singleton vs. Transient in .NET - How They Differ? Ever wondered which service lifetime to choose when registering dependencies in .NET? Here’s a breakdown of each: Transient - Creates a new instance every time it’s requested. - Lightweight and stateless by nature. - Ideal for short-lived operations or isolated tasks. Scoped - Creates one instance per HTTP request. - Shares the same instance across the request pipeline. - Useful for UoW patterns and request-specific data. Singleton - Creates one instance for the entire app lifetime. - Reused across all requests and threads. - Best for caching, configuration or shared services. When to Use? Transient → For stateless, short-lived tasks. Scoped → For services tied to a single request. Singleton → For shared data and long-living services. 👉 Want to dive deeper into each? Swipe! ——— 🔔 Follow Asim Noor for more .NET insights! ♻️ Repost to help your network!

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🚨 WORST Angular MISTAKES TO AVOID 🚨  After reviewing projects, mentoring teams, and digging into Angular features, I’ve noticed the same mistakes repeating again and again. Some come from rushing deadlines, some from habits carried over from older Angular versions, and some from not keeping up with the latest best practices.  I’ve grouped them into two simple categories 👇  🧩 Bad Coding & Architecture Practices   - Skipping unit & integration tests   - Hardcoding configs & environment values   - Mixing business logic inside components   - Overusing 3rd-party dependencies (npm fatigue)   - Avoiding state management for complex flows   - Mutating state directly (breaking immutability)   - Misunderstanding dependency injection scopes   - Copy-paste driven development instead of abstraction   - Ignoring smart/dumb component separation   - Creating “god services” that handle everything   - Forgetting route guards & lazy route protection   ---more ⚡ Performance & Modern Angular Pitfalls   - Ignoring OnPush change detection (or applying it blindly)   - Binding functions directly in templates   - Overusing async pipes everywhere   - Nesting subscribes instead of using switchMap/mergeMap   - Not unsubscribing (or not using takeUntilDestroyed / asyncPipe)   - Misusing Signals like Observables   - Forgetting lazy loading & route-level code splitting   - Ignoring hydration & defer blocks in Angular 17/18   - Overusing ChangeDetectorRef.detectChanges()   - Not using trackBy in @for loops (huge perf issue in lists)   - Skipping SSR, pre-rendering, or PWA optimizations   ---more 💡 The good news? Almost all of these mistakes have straightforward fixes if you adopt modern Angular patterns, profiling tools, and a clean architecture mindset.  👉 I’ve put the full detailed checklist (80+ pitfalls) into a single copy-ready format, happy to share if you want it.  💬 What’s the worst Angular mistake you’ve seen in production?  Follow Sonu Sindhu for more Angular tips & clean code practices 🚀  #Angular #WebDevelopment #Performance #CleanCode #Frontend #JavaScript

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𝗕𝗲𝘀𝘁 .𝗡𝗘𝗧 𝗧𝗼𝗼𝗹𝘀 & 𝗣𝗮𝗰𝗸𝗮𝗴𝗲𝘀 𝗘𝘃𝗲𝗿𝘆 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 𝗦𝗵𝗼𝘂𝗹𝗱 𝗞𝗻𝗼𝘄! The .NET ecosystem is huge, and choosing the right tools can save you 𝘁𝗶𝗺𝗲, 𝗲𝗳𝗳𝗼𝗿𝘁, 𝗮𝗻𝗱 𝗵𝗲𝗮𝗱𝗮𝗰𝗵𝗲𝘀. That’s why I have created this list of the 𝗺𝗼𝘀𝘁 𝗽𝗼𝗽𝘂𝗹𝗮𝗿 𝗮𝗻𝗱 𝘂𝘀𝗲𝗳𝘂𝗹 .𝗡𝗘𝗧 𝘁𝗼𝗼𝗹𝘀 & 𝗹𝗶𝗯𝗿𝗮𝗿𝗶𝗲𝘀 across different categories: 🔐 𝗔𝘂𝘁𝗵𝗲𝗻𝘁𝗶𝗰𝗮𝘁𝗶𝗼𝗻 – JWT, IdentityServer, OpenIddict, Duende, Ocelot, OAuth 🗄️ 𝗢𝗥𝗠 – EF Core, Dapper, NHibernate, Marten, OrmLite, PetaPoco 🧪 𝗧𝗲𝘀𝘁𝗶𝗻𝗴 – xUnit, NUnit, MSTest, FluentAssertions, Moq, Bogus 📜 𝗟𝗼𝗴𝗴𝗶𝗻𝗴 – Serilog, NLog, log4net, Elastic APM, Seq, Splunk ⚙️ 𝗣𝗹𝗮𝘁𝗳𝗼𝗿𝗺𝘀 – ASP.NET Core, Blazor, MAUI, Xamarin, Orleans, gRPC ⏳ 𝗕𝗮𝗰𝗸𝗴𝗿𝗼𝘂𝗻𝗱 𝗣𝗿𝗼𝗰𝗲𝘀𝘀𝗶𝗻𝗴 – Hangfire, Quartz.NET, MassTransit, RabbitMQ, Azure Service Bus, MediatR 📊 𝗥𝗲𝗽𝗼𝗿𝘁𝗶𝗻𝗴 – DinkToPdf, QuestPDF, iText7, DevExpress, SyncFusion, Stimulsoft 🎨 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱 𝗨𝗜 – MudBlazor, Blazorise, Radzen, Syncfusion UI, Telerik UI, LiveCharts2 💡 These tools are not just “nice-to-have” — they are the 𝗯𝘂𝗶𝗹𝗱𝗶𝗻𝗴 𝗯𝗹𝗼𝗰𝗸𝘀 behind modern, scalable, and maintainable .NET applications. 👉 Which ones are your go-to in real projects? 👉 Any favorites I missed that you think should be on the list? 𝗡𝗼𝘁𝗲: Some tools in this list may overlap categories. For example:  • MediatR → not a scheduler like Hangfire/Quartz, but often used for in-process workflows (notifications, commands, async operations).  • gRPC → technically a framework/protocol, but I grouped it under Platforms for simplicity.  • Ocelot → commonly used as an API Gateway in .NET microservices. 👉 The intention of this list is not strict classification, but to highlight the most useful and widely adopted tools that real projects rely on. #dotnet #csharp #programming #developers #softwareengineering

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🚀 𝐖𝐡𝐚𝐭’𝐬 𝐭𝐡𝐞 𝐃𝐢𝐟𝐟𝐞𝐫𝐞𝐧𝐜𝐞 𝐁𝐞𝐭𝐰𝐞𝐞𝐧 ‘𝐔𝐬𝐞’, ‘𝐌𝐚𝐩’, 𝐚𝐧𝐝 ‘𝐑𝐮𝐧’ 𝐢𝐧 𝐀𝐒𝐏.𝐍𝐄𝐓 𝐂𝐨𝐫𝐞 𝐌𝐢𝐝𝐝𝐥𝐞𝐰𝐚𝐫𝐞? 🚀 ⁉️ 𝐄𝐯𝐞𝐫 𝐛𝐞𝐞𝐧 𝐜𝐨𝐧𝐟𝐮𝐬𝐞𝐝 𝐚𝐛𝐨𝐮𝐭 𝐰𝐡𝐞𝐧 𝐭𝐨 𝐜𝐡𝐨𝐨𝐬𝐞 𝐔𝐬𝐞, 𝐌𝐚𝐩, 𝐨𝐫 𝐑𝐮𝐧 𝐢𝐧 𝐀𝐒𝐏.𝐍𝐄𝐓 𝐂𝐨𝐫𝐞? Let’s break it down in a clear and simple way 👇 🧱 𝑾𝒉𝒂𝒕 𝒊𝒔 𝑴𝒊𝒅𝒅𝒍𝒆𝒘𝒂𝒓𝒆? In ASP.NET Core, middleware is a component that handles HTTP requests and responses. Each component can: Decide whether to pass the request to the next component in the pipeline. Perform actions before and/or after the next component executes. ⚙️ 𝑾𝒉𝒂𝒕 𝑨𝒓𝒆 𝑹𝒆𝒒𝒖𝒆𝒔𝒕 𝑫𝒆𝒍𝒆𝒈𝒂𝒕𝒆𝒔? Request delegates process HTTP requests and they’re configured using Use, Map, and Run. Here’s how they differ: 🔁 𝐔𝐬𝐞 – 𝐂𝐡𝐚𝐢𝐧 Use lets you chain multiple delegates together. You get a next parameter, and you can choose whether to call it or not. ✅ If you skip next(), the pipeline ends there — this is called short-circuiting. ⛔ 𝐑𝐮𝐧 – 𝐄𝐧𝐝 𝐭𝐡𝐞 𝐏𝐢𝐩𝐞𝐥𝐢𝐧𝐞 Run is a terminal middleware. It does not receive a next parameter and stops the pipeline when called. A̳n̳y̳ ̳m̳i̳d̳d̳l̳e̳w̳a̳r̳e̳ ̳r̳e̳g̳i̳s̳t̳e̳r̳e̳d̳ ̳a̳f̳t̳e̳r̳ ̳R̳u̳n̳ ̳w̳i̳l̳l̳ ̳n̳o̳t̳ ̳b̳e̳ ̳e̳x̳e̳c̳u̳t̳e̳d̳.̳ 🌳 𝐌𝐚𝐩 – 𝐁𝐫𝐚𝐧𝐜𝐡 𝐭𝐡𝐞 𝐏𝐢𝐩𝐞𝐥𝐢𝐧𝐞 If you need to branch the pipeline, you can use Map. What is branching?  It is used like a convention. For instance, if the request path starts with the given path, the branch is executed.   This is great for modularizing your app and handling specific routes differently. 💬 Which one do you use most often? And did you learn something new today? Let’s discuss in the comments 👇 #dotnet #aspnetcore #middleware #csharp #backend #webdevelopment #programming

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Deadlock in Async Programming — Why it can still happen with async/await? Many developers assume that using async/await guarantees immunity from deadlocks. Unfortunately, that’s not always true — especially in UI applications (WinForms, WPF) or the legacy ASP.NET SynchronizationContext. The Problem: The most common mistake is calling an async method synchronously, like this: var result = GetDataAsync().Result; // or .Wait() What happens behind the scenes: The UI or request thread blocks, waiting for the async call to complete. The async method tries to resume on the same thread/context after the await. That thread is already blocked → Deadlock! The Solution Always use await instead of .Result or .Wait(). For library or non-UI code: var result = await GetDataAsync().ConfigureAwait(false); This prevents context capture, avoids deadlocks, and often improves performance. Pro Tips: In ASP.NET Core, there’s no SynchronizationContext by default → fewer deadlocks. In UI apps, never block the UI thread — keep async flow end-to-end. Use ConfigureAwait(false) consistently in reusable libraries. Have you ever run into a deadlock caused by Task.Result or Wait() in your projects? How did you solve it? #DotNet #CSharp #AsyncProgramming #Deadlock #Concurrency #Multithreading #SoftwareDevelopment #CodingBestPractices

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Understanding ASP.NET Core Project Folder Structure 🧩 🔍 A well-structured ASP.NET Core project makes your application: ✅ More maintainable ✅ Easy to scale ✅ Easier for new developers to understand Let’s break down the typical folders and files you’ll see in a new ASP.NET Core Web App 👇 --- 📁 Connected Services 🧠 Use this when you connect to external services like REST APIs, gRPC, Azure storage, or other third-party cloud integrations. 💡 It auto-generates helper classes that simplify consuming those services. 📁 Dependencies 📦 Lists all your NuGet packages and project references. 🔧 These packages extend your app’s capabilities (like Entity Framework Core, Swagger, etc.). 📁 wwwroot 🌐 This is the only folder accessible publicly (client-side). 📁 It contains static files like: HTML, CSS, JS Fonts and images 💡 Example: site.css, logo.png 📁 Controllers 🧭 This is where your main logic goes — it handles incoming requests. Each controller (e.g., HomeController.cs) processes a route and returns a response (like a view or JSON). 🔁 Often paired with models and views. 📁 Models 🧱 Represents your application data. 📦 It contains classes that define the structure of your objects (DTOs, ViewModels, Domain Models). 💡 Example: User.cs, Product.cs 📁 Views 🖼️ Stores the front-end Razor (.cshtml) files. 🎨 Think of them as HTML templates with embedded C# logic. 💡 Follows MVC: A view for each controller action (e.g., Views/Home/Index.cshtml) 📄 Program.cs 🎯 The entry point of your ASP.NET Core app. 🧩 It configures the web host and sets up the app builder. You’ll find lines like app.UseRouting(), app.UseEndpoints(), etc. 📄 Startup.cs 🧰 (Optional in .NET 6+, but used in earlier versions) Configures services like DB context, Authentication, Middleware. 🔧 Contains methods like: ConfigureServices() Configure() --- 🧠 Why it matters: A clean folder structure not only helps you manage your codebase efficiently but also prepares you to work in real-world enterprise applications.

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🚀 .NET Interview Q&A – Real-World Scenarios Are you preparing for a .NET developer role? Many interviews now focus on practical scenarios, not just syntax. Here are 5 scenario-based questions to test your readiness: 1️⃣ How would you handle a memory leak in a .NET application? ✅ Use profiling tools like dotMemory or PerfView. Analyze object retention paths, dispose unmanaged resources, and avoid static references where not needed. 2️⃣ How do you implement caching in a .NET web API? ✅ Use IMemoryCache or IDistributedCache in .NET Core. Consider sliding/absolute expiration and invalidation strategy. 3️⃣ What’s your approach to handling large file uploads in ASP.NET Core? ✅ Stream the file directly to disk or cloud storage using buffered or streamed request reading. 4️⃣ How do you design a scalable architecture for high-traffic .NET web apps? ✅ Apply principles like microservices, caching layers, async processing, and queue-based messaging (e.g., Azure Service Bus). 5️⃣ How would you troubleshoot high CPU usage in a live .NET app? ✅ Use dotnet-trace, analyze thread stacks, GC stats, and performance counters. 🔍 Interviews today require you to think like a system designer, not just a coder. 📩 Let me know if you'd like a PDF version or infographic of these Q&As! #DotNet #SoftwareEngineering #TechInterviews #BackendDev #DotNetCore #InterviewTips #CleanCode #SystemDesign #LinkedInLearning #CSharp

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🚀 .NET Core Interview Questions to Strengthen Your Prep Here are some important questions you should know when preparing for .NET Core and ASP.NET Core interviews: 1️⃣ Can you explain the different Access Specifiers in .NET and why they matter? 2️⃣ What is Middleware in ASP.NET Core, and how would you write a custom one? 3️⃣ How is Error Handling implemented in ASP.NET Core applications? 4️⃣ What’s the role of Dependency Injection in .NET Core, and how does it improve code maintainability? 5️⃣ How do Kestrel and IIS differ, and where are they used in .NET Core hosting? 6️⃣ Could you describe the difference between MVC and Razor Pages in .NET Core? 7️⃣ How does .NET Core manage Logging & Monitoring in production? 8️⃣ What are Filters, and how are they different from Middleware? 9️⃣ Explain Entity Framework Core – why would you choose it, and what advantages does it bring? 🔟 How would you implement JWT Authentication in ASP.NET Core? 1️⃣1️⃣ How does Routing work in ASP.NET Core, and what are Attribute Routes? 1️⃣2️⃣ What exactly is an Access Token, and how is it used in securing .NET Core apps? ✨ These questions not only help in interviews but also deepen your understanding of .NET Core fundamentals. #dotnet #aspnetcore #mvc #entityframework #middleware #authentication #csharp #logging #razorpages

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🚀 .NET Interview Tip of the Day ❓ Question: 👉 What is Garbage Collection (GC) in .NET, and why is it important? ✅ Answer: In .NET, Garbage Collection (GC) is the built-in memory manager that keeps your applications efficient by automatically cleaning up objects you no longer use. 🔍 How it works: • The .NET runtime tracks objects in memory. • When an object is no longer referenced, GC reclaims that memory. • GC uses Generations (Gen 0, Gen 1, Gen 2) for efficiency, assuming short-lived objects die young. 💡 Why it matters: • ✅ Prevents memory leaks • ✅ Eliminates need for manual memory cleanup • ✅ Keeps apps stable and performant 📌 Example: MyClass obj = new MyClass(); // Once obj is out of scope, GC will reclaim it automatically. 🔑 Pro Tip: GC handles managed objects — but for unmanaged resources (files, DB connections, sockets), always implement IDisposable and use: using(var resource = new MyResource()) { ... } 👉 That way, you combine the power of automatic GC with manual resource control for rock-solid applications. ⸻ ⚡ Remember: GC makes .NET development easier, but good developers still manage resources wisely! #DotNet #CSharp #AsyncAwait #CodingTips #InterviewPrep #DotNetDevelopers #SoftwareDevelopment #WebDevelopment #BackendDevelopment #CleanCode #SystemDesign #ProgrammingTips #TechCareers #Developers #CodingLife #TechCommunity #LearningInPublic #CodeNewbie #MicrosoftDotNet

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