ASP.NET Core Interview Q&A 

1. • Answer: ASP.NET Core is an open-source, cross-platform web framework developed by Microsoft for building modern, cloud-based, and high-performance web applications.

2. What are the key features of ASP.NET Core?

   • Answer: Some key features include cross-platform support, improved performance, modularity, built-in dependency injection, and cloud-ready configuration.

3. Explain the difference between ASP.NET Core and ASP.NET Framework.

   • Answer: ASP.NET Core is cross-platform and modular, while ASP.NET Framework is Windows-specific. Core is more lightweight and has better performance.

4. What is Middleware in ASP.NET Core?

   • Answer: Middleware in ASP.NET Core is a pipeline of components that can handle requests and responses. Each component in the pipeline performs a specific task, like authentication, routing, or logging.

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

   • Answer: Dependency Injection is a design pattern used to inject dependencies (services) into classes rather than hard-coding them. It promotes modularity, testability, and maintainability in ASP.NET Core applications.

6. Explain the concept of Razor Pages.

   • Answer: Razor Pages is a page-based programming model in ASP.NET Core for building web UIs. It simplifies the development of web pages by combining HTML and C# code in a single file.

7. What is the use of the appsettings.json file in ASP.NET Core?

   • Answer: The appsettings.json file is used for configuring application settings, such as connection strings, API keys, and other parameters. It allows easy configuration changes without modifying code.

8. How can you enable Cross-Origin Resource Sharing (CORS) in an ASP.NET Core application?

   • Answer: You can enable CORS by configuring the Startup.cs file, specifically in the ConfigureServices and Configure methods. You need to specify which origins are allowed to access your resources.

9. What is Entity Framework Core, and how is it related to ASP.NET Core?

   • Answer: Entity Framework Core is an Object-Relational Mapping (ORM) framework for data access. It's often used in ASP.NET Core applications to work with databases by mapping objects to database tables.

10. Explain the purpose of the ConfigureServices and Configure methods in the Startup.cs file.

    • Answer: The ConfigureServices method is used to configure and register application services, while the Configure method sets up the request processing pipeline in an ASP.NET Core application.

11. How can you implement authentication and authorization in ASP.NET Core?

    • Answer: You can implement authentication and authorization using middleware components like Identity, JWT tokens, or third-party authentication providers. These components help secure and control access to your application.

12. What is the role of the ASP.NET Core Hosting Environment?

    • Answer: The hosting environment provides information about the environment in which the application is running, such as Development, Staging, or Production. It helps in configuring the application appropriately.

13. How can you manage and log application events in ASP.NET Core?

    • Answer: ASP.NET Core provides built-in logging capabilities through the ILogger interface and various logging providers. You can configure logging levels and target destinations like the console, files, or external services.

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

    • Answer: Tag Helpers are a feature in ASP.NET Core that allows developers to create custom HTML-like tags and attributes that are processed on the server. They simplify working with HTML in Razor views.

15. Explain the process of deploying an ASP.NET Core application.

    • Answer: Deploying an ASP.NET Core application typically involves publishing the application, setting up a web server (e.g., IIS or Kestrel), configuring environment variables, and ensuring proper security and performance settings for production.

Remember that the depth of these questions and answers can vary depending on the level of the position you're interviewing for, so be prepared for more detailed follow-up questions.