C# Most FAQ in Interview

1. What is the difference between Abstract class & Interface? When to use Interface and when to use Abstract class?
2. What is the scenario for multiple inheritances? Can you give an example?
3. What are differences between IQueryable & IEnumerable?
4. What are the difference between List & IEnumerable? Which is better?
5. What is anonymous type? What is the difference between ‘var’ & ‘dynamic’?
6. Can you explain about dependency injection?
7. What are delegate and multi-cast delegate?
8. What is anonymous method? 
9. What is the lambda expression and expression tree?
10. What is Lazy loading in C#?
11. What is generation mechanism in memory management?
12. What is extension method?
13. What is the difference between finally and finalize?
14. What is a strong name in assembly? What is satellite assembly?
15.  What is delay signing? What are the type of signing in assembly & whats the difference?
16. What are the types of inheritance? Describe all.
17. What is the difference between a class & structure?
18. What is a virtual class? Why we use virtual class?
19. Suppose I need to use an DLL & I want to overwrite DLL method. What are the steps to achieve this?
20. What is serialization? Why we use it? What are the types of serialization?
21. What is a threading? What are its different types?
22. What is "yield" keyword in C#?