Top 100 .NET Interview Questions List

Preparing for a .NET interview can be both exciting and nerve-wracking. As a candidate, it’s crucial to have a solid understanding of .NET concepts, frameworks, and best practices. In this article, we present the Top 100 .NET Interview Questions List to help you ace your next interview. Whether you are a seasoned professional or just starting, this list covers a range of topics that are commonly discussed in interviews.

Table of Content

1. Understanding the .NET Framework
2. C# Specific Questions
3. ASP.NET Questions
4. Entity Framework Questions
5. ASP.NET Core Questions
6. Web Services Questions
7. Design Patterns Questions
8. Testing and Debugging Questions
9. Performance and Optimization Questions
10. Miscellaneous Questions
11. Conclusion

Understanding the .NET Framework

1. What is .NET Framework?
2. Explain the difference between .NET Core and .NET Framework.
3. What is the Common Language Runtime (CLR)?
4. What is the role of the Global Assembly Cache (GAC)?
5. Describe the .NET Standard.
6. What are the different types of .NET applications?
7. Explain the concept of assemblies in .NET.
8. What is an executable and a library in .NET?
9. What are the types of assemblies in .NET?
10. What is the difference between managed and unmanaged code?

C# Specific Questions

11. What are the key features of C#?
12. Explain the concept of value types and reference types in C#.
13. What is the purpose of the using statement in C#?
14. How does garbage collection work in C#?
15. What is an interface, and how does it differ from an abstract class?
16. Explain method overloading and overriding in C#.
17. What are delegates, and how are they used in C#?
18. What is LINQ, and how does it work in C#?
19. Explain the concept of asynchronous programming in C#.
20. What are generics in C#, and why are they useful?

ASP.NET Questions

21. What is ASP.NET?
22. Explain the difference between ASP.NET Web Forms and ASP.NET MVC.
23. What are Razor pages in ASP.NET Core?
24. How does model binding work in ASP.NET?
25. What are action filters in ASP.NET MVC?
26. Describe the ASP.NET MVC request lifecycle.
27. What is dependency injection in ASP.NET Core?
28. How do you manage state in ASP.NET applications?
29. What are partial views in ASP.NET MVC?
30. Explain the concept of routing in ASP.NET MVC.

Entity Framework Questions

31. What is Entity Framework?
32. Explain the difference between Code First, Database First, and Model First approaches in Entity Framework.
33. What are migrations in Entity Framework?
34. How do you handle concurrency in Entity Framework?
35. What is lazy loading and eager loading in Entity Framework?
36. Explain the concept of DbContext in Entity Framework.
37. What is LINQ to Entities?
38. How do you perform CRUD operations using Entity Framework?
39. What are navigation properties in Entity Framework?
40. Explain the relationship types in Entity Framework.

ASP.NET Core Questions

41. What is ASP.NET Core?
42. Explain the middleware concept in ASP.NET Core.
43. How do you configure services in ASP.NET Core?
44. What is the Startup class in ASP.NET Core?
45. What are Razor components in ASP.NET Core?
46. Explain the differences between MVC and Razor Pages in ASP.NET Core.
47. How do you implement authentication and authorization in ASP.NET Core?
48. What is the purpose of the appsettings.json file in ASP.NET Core?
49. Explain how to handle exceptions in ASP.NET Core applications.
50. What is SignalR, and how is it used in ASP.NET Core?

Web Services Questions

51. What is a web service?
52. Explain the difference between SOAP and RESTful services.
53. What is WCF (Windows Communication Foundation)?
54. How do you implement RESTful services in ASP.NET?
55. What are the HTTP methods used in RESTful services?
56. Explain how to consume a RESTful API in .NET.
57. What is the role of serialization and deserialization in web services?
58. How do you secure a web service?
59. What is Swagger, and how is it used in ASP.NET Core?
60. Explain the concept of versioning in web APIs.

Also Read: Best Angular Interview Questions For Freshers

Design Patterns Questions

61. What are design patterns?
62. Explain the Singleton pattern.
63. What is the Repository pattern?
64. Describe the Dependency Injection pattern.
65. What is the Factory pattern?
66. Explain the Observer pattern.
67. What is the purpose of the Command pattern?
68. Describe the Strategy pattern.
69. What is the Adapter pattern?
70. Explain the concept of the MVC pattern.

Testing and Debugging Questions

71. What is unit testing?
72. Explain the role of NUnit or MSTest in .NET testing.
73. How do you mock dependencies in unit tests?
74. What is integration testing?
75. Explain how to perform debugging in Visual Studio.
76. What are assertions in testing?
77. Describe Test-Driven Development (TDD).
78. What is continuous integration?
79. How do you handle exceptions in unit tests?
80. Explain the concept of code coverage.

Performance and Optimization Questions

81. How do you optimize the performance of a .NET application?
82. What are the common performance bottlenecks in .NET applications?
83. Explain caching in .NET.
84. What is the difference between in-memory and distributed caching?
85. How do you profile a .NET application?
86. Explain the use of async/await in improving performance.
87. What are the implications of using too many threads?
88. How can you reduce memory consumption in .NET applications?
89. Describe the role of performance counters in monitoring applications.
90. What is garbage collection tuning, and how can it be done?

Miscellaneous Questions

91. What is the .NET CLI?
92. Explain the role of NuGet packages in .NET.
93. What are the common tools used for .NET development?
94. How do you implement logging in a .NET application?
95. What are the security best practices for .NET applications?
96. How do you deploy a .NET application?
97. What is the role of web.config and app.config files?
98. Explain the differences between synchronous and asynchronous programming.
99. What is the purpose of the async keyword in C#?
100. How do you stay updated with the latest developments in .NET?

Conclusion

Preparing a .NET interview questions list requires a solid understanding of various concepts, frameworks, and best practices. The Top 100 .NET Interview Questions List provided in this article is designed to help you grasp key topics and increase your confidence. Whether you are applying for a junior or senior position, familiarity with these questions will set you on the right path to success.

By focusing on these topics and practicing your responses, you will be well-equipped to demonstrate your skills and knowledge in any .NET interview. Good luck!