🧱 .NET Core – Interview Preparation Topics

This section covers essential .NET Core topics frequently asked in backend and system design interviews. Explore its architecture, runtime behavior, platform independence, CLI tools, performance optimizations, configuration strategies, and DI support. Each topic includes MCQs, real-world interview questions, and practical code examples.

• 1. What is .NET Core and how is it different from .NET Framework?
• 2. How does dependency injection work in ASP.NET Core?
• 3. What are the advantages of using .NET Core?
• 4. Explain middleware in ASP.NET Core.
• 5. What is the purpose of Startup.cs in ASP.NET Core?
• 6. How is configuration handled in ASP.NET Core?
• 7. What are the different environments in ASP.NET Core (Development, Staging, Production)?
• 8. What is Kestrel in ASP.NET Core?
• 9. Explain the difference between IWebHostBuilder and Generic Host.
• 10. What is .Net Standard?
• 11. What is .Net Framework?
• 12. .NET Application Domain
• 13. Difference between String and string in .net core?
• 14. Role of Generic Host in .Net Core?
• 15. Use of Value and Reference Type in .Net Core
• 16. Explain Ioc (DI) container.
• 17. What is MSIL and its Role in ASP.NET Core?
• 18. Explain some CLR Services?
• 19. What is CTS?
• 20. What is CLR?
• 21. What is unmanaged resource in .NET?
• 22. Difference between Boxing and Unboxing?
• 23. Explain decimal, float, and double in .NET
• 24. Explain some characteristics of .NET Core?
• 25. Difference between .NET Core and Mono?
• 26. Difference between Runtime and SDK in .NET Core?
• 27. What officially replace WCF in .NET Core?
• 28. Some benefits for using Options Pattern in .NET Core?
• 29. How you can create your own scope for a Scoped Object in .NET Core?
• 30. Difference between AppDomain, Assembly, Process and a Thread?
• 31. Does .NET Support Multiple Inheritance?
• 32. What is the difference between .Net Framework/Core and .Net Standard Class Library project types?
• 33. How to choose target version of .Net Standard library?
• 34. Could you name the difference between .net core, portable, standard, compact, UWP, PCL?
• 35. Use of Finalize vs Dispose in .NET?
• 36. Deployment consideration of Hosted Services
• 37. How many JIT compilation you are aware?
• 38. Difference between Node.js async model and async/await in .NET?
• 39. Explain how does Asynchronous task Async/Await work in .NET?
• 40. Difference between RyuJit and Rosyln?
• 41. What is difference between IHost, IHostBuilder and IHostedService?
• 42. Use of Transient vs Scoped vs Singleton DI services lifetimes?
• 43. Hosted Services vs Windows Services?
• 44. Different types of Inheritance in .NET?
• 45. Difference between CIL and MSIL(IL)?
• 46. Some Benefits for using JIT?
• 47. What is Implicit Compilation process?
• 48. Why does .NET use a JIT compiler instead of just compiling the code on the target machine?
• 49. What is correct paatern to implement long running background work in ASP.NET Core?
• 50. Explain MVC in .NET Core?
• 51. Explain the use of Background Service in ASP.NET Core?
• 52. Difference between .NET Stancdard vs PCL (Portable Class Library)
• 53. What is CLS?
• 54. Difference between .NET Core, .NET Framework vs Xamarin?
• 55. Difference between Managed vs UnManaged Code in .NET?
• 56. What is FCL?
• 57. What is Explicit Compilation?
• 58. Is there any way to catch the multiple exceptions at once and without code duplication?
• 59. What is codeCLR? and Benefits of Explicit Compilation (AOT)?
• 60. Difference between Task and Thread in .NET?
• 61. Types of deployment in .NET Core applications
• 62. When using DI in Controller shall I call IDisposable on any injected service?