Interview : ASP.NET Core and C# applications. These questions cover a range of topics commonly encountered when working with ASP.NET Core applications.

 

1. What is ASP.NET Core, and how is it different from ASP.NET Framework?

   • Answer: ASP.NET Core is a cross-platform, open-source framework for building web applications. It differs from ASP.NET Framework in that it's platform-agnostic, lightweight, and designed for modern web development.

2. What are the main advantages of using ASP.NET Core over ASP.NET Framework?

   • Answer: Some advantages include better performance, cross-platform compatibility, improved modularity, and support for modern development practices like microservices and containerization.

3. What is Middleware in ASP.NET Core?

   • Answer: Middleware is a component that processes HTTP requests and responses in the ASP.NET Core pipeline. It can handle tasks like authentication, routing, and logging.

4. How do you handle routing in ASP.NET Core?

   • Answer: You define routes in the Startup.cs using the app.UseEndpoints method. Routes are configured using attributes or the conventional route pattern.

5. What is Dependency Injection, and why is it important in ASP.NET Core?

   • Answer: Dependency Injection is a design pattern used to manage object dependencies. In ASP.NET Core, it's built into the framework and allows you to inject services into your application components, promoting modularity and testability.

6. Explain the role of the ConfigureServices and Configure methods in the Startup class.

   • Answer: ConfigureServices is where you register application services and configure the dependency injection container. Configure is where you define how the application responds to HTTP requests.

7. How can you manage user authentication and authorization in ASP.NET Core?

   • Answer: ASP.NET Core provides built-in authentication and authorization mechanisms. You can configure these in the Startup.cs and use libraries like Identity or third-party OAuth providers.

8. What is Entity Framework Core, and how does it relate to databases in ASP.NET Core applications?

   • Answer: Entity Framework Core is an Object-Relational Mapping (ORM) framework. It simplifies database access in ASP.NET Core applications by providing a way to work with databases using C# objects.

9. What is Razor Pages in ASP.NET Core?

   • Answer: Razor Pages is a framework for building web pages in ASP.NET Core. It combines HTML markup with C# code using a simple and intuitive syntax.

10. How do you handle form submissions in ASP.NET Core?

    • Answer: You can use the [HttpPost] attribute to handle form submissions in ASP.NET Core controllers. Data from the form is usually bound to a model using model binding.

11. What is a RESTful API, and how do you create one in ASP.NET Core?

    • Answer: A RESTful API is an architectural style for designing networked applications. In ASP.NET Core, you can create RESTful APIs using controllers, actions, and HTTP methods (GET, POST, PUT, DELETE).

12. Explain Cross-Origin Resource Sharing (CORS) and how to enable it in ASP.NET Core.

    • Answer: CORS is a security feature that controls which domains can access your web application. You can enable CORS in ASP.NET Core by configuring it in the Startup.cs using the app.UseCors method.

13. What is SignalR, and how is it used in ASP.NET Core?

    • Answer: SignalR is a library for adding real-time functionality to web applications. It allows server-to-client and client-to-server communication. You can use it for features like chat, notifications, and live updates.

14. How can you handle exceptions in ASP.NET Core applications?

    • Answer: You can use the global exception handling middleware or handle exceptions at the controller level. ASP.NET Core also provides various built-in exception types to cover common scenarios.

15. What are Tag Helpers in ASP.NET Core?

    • Answer: Tag Helpers are a feature in ASP.NET Core that simplifies working with HTML in Razor views. They allow you to create HTML elements that are strongly typed and interact with server-side code.

These questions and answers should help you better understand key concepts and techniques when working with ASP.NET Core and C# applications.