100 most asked interview Questions and answers for C# dot net developers

Here is a list of 100 C# dot net interview questions and answers for developers. You can download answer document using follow instructions.

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1. What is C#? What are its key features?
2. Explain the difference between ref and out parameters in C#.
3. What are delegates and how are they used?
4. Describe the difference between IEnumerable and IQueryable.
5. What are the different types of inheritance in C#?
6. What is the purpose of the using statement in C#?
7. Explain the difference between StringBuilder and String.
8. What is the difference between == and .Equals() in C#?
9. How does garbage collection work in C#?
10. What are lambda expressions in C# and how are they used?
11. What are extension methods in C#?
12. Explain the concept of boxing and unboxing.
13. Describe the async and await keywords in C#.
14. What is the purpose of the volatile keyword in C#?
15. How does exception handling work in C#?
16. What is the finally block used for in exception handling?
17. Describe the difference between String and StringBuilder.
18. Explain the difference between abstract classes and interfaces.
19. What are generics in C# and how are they used?
20. How does the using statement work with IDisposable objects?
21. What is polymorphism in C#?
22. Explain the difference between static and instance members.
23. How does method overloading differ from method overriding?
24. Describe the purpose of the as operator in C#.
25. What is the difference between sealed and static classes?
26. Explain the purpose of the lock statement in C#.
27. Describe the different types of collections available in C#.
28. What is the difference between Array and ArrayList?
29. How does LINQ work in C#?
30. Explain the concept of anonymous types in C#.
31. Describe the use of yield keyword in C#.
32. What is the difference between FirstOrDefault() and First() in LINQ?
33. Explain the use of partial classes in C#.
34. What is the purpose of attributes in C#?
35. Describe the difference between Task and Thread.
36. How does method chaining work in LINQ?
37. Explain the concept of dependency injection (DI) and how it is implemented in C#.
38. What are the SOLID principles? How do they apply to C# programming?
39. Describe the concept of reflection in C#.
40. How does serialization work in C#?
41. Explain the difference between is and as operators in C#.
42. Describe the use of Action and Func delegates.
43. What is an anonymous method in C#?
44. Explain the concept of a nullable type (?) in C#.
45. How does indexing work in C# arrays?
46. Describe the concept of covariance and contravariance.
47. What is the difference between DateTime and DateTimeOffset?
48. Explain how events work in C#.
49. Describe the purpose of the using static directive in C#.
50. What are the advantages of using async-await over traditional asynchronous programming techniques?

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