OOPS Interview Questions

1. OOPS methodologies with all explanations?
2. Write a program to count the object instantiation?
3. Interfaces, abstract methods and its disadvantages?
4. Different types of classes in OOPS?
5. run-time polymorphism with all examples as well code modification?
6. can i create constructor with parameterized without default constructor?
7. Difference between Static and normal constructor in c#.net?
8. what are indexers in C#.NET OOPS 
9. abstract classes and interfaces?
10. What is partial class?
11. Polymorphism-- over load and over rides.
12. abstract class vs interfaces.
13. how to compare two objects like obj1=obj2 or obj1.equals(obj2)
14. access specifiers
15. over ride
16. shared methods..
17. generic classes
18. delegates
19. in over ride concept how to call the derived class
20. method with factory objects.
21. sealed keyword
22. we have 3 methods in one class. how to hide one method  in the derived class or normal class or creating object for class also.
23. Aggregation and Association