.NET Interview questions and Answers: 6

OOPS

1. What is Object Oriented Programming ?
2. What’s a Class ?
3. What’s a Object ?
4. What’s the relation between Classes and Objects ?
5. What are different properties provided by Object-oriented systems ?
6. Twist :- Can you explain different properties of Object Oriented Systems?
7. Twist :- What’s difference between Association , Aggregation and Inheritance relationships?
8. How can we acheive inheritance in VB.NET ?
9. What are abstract classes ?
10. What’s a Interface ?
11. What is difference between abstract classes and interfaces?
12. What is a delegate ?
13. What are event’s ?
14. Do events have return type ?
15. Can event’s have access modifiers ?
16. Can we have shared events ?
17. What is shadowing ?
18. What’s difference between Shadowing and Overriding ?
19. What’s difference between delegate and events?
20. If we inherit a class do the private variables also get inherited ?
21. What are different accessibility levels defined in .NET ?
22. Can you prevent a class from overriding ?
23. What’s the use of “MustInherit” keyword in VB.NET ?
24. Why can not you specify accessibility modifier in Interface ?
25. What are similarities between Class and structure ?
26. What’s the difference between Class and structure’s ?
27. What does virtual keyword mean ?
28. What are shared (VB.NET)/Static(C#) variables?
29. What is Dispose method in .NET ?
30. Whats the use of “OverRides” and “Overridable” keywords ?
31. Where are all .NET Collection classes located ?
32. What is ArrayList ?
33. What’s a HashTable ?
34. Twist :- What’s difference between HashTable and ArrayList ?
35. What are queues and stacks ?
36. What is ENUM ?
37. What is nested Classes ?
38. What’s Operator Overloading in .NET?
39. In below sample code if we create a object of class2 which constructor will fire first ?
40. What’s the significance of Finalize method in .NET?
41. Why is it preferred to not use finalize for clean up?
42. How can we suppress a finalize method?
43. What’s the use of DISPOSE method?
44. How do I force the Dispose method to be called automatically, as clients can forget to call Dispose method?
45. In what instances you will declare a constructor to be private?
46. Can we have different access modifiers on get/set methods of a property ?
47. If we write a goto or a return statement in try and catch block will the finally block execute ?
48. What is Indexer ?
49. Can we have static indexer in C# ?
50. In a program there are multiple catch blocks so can it happen that two catch blocks are executed ?
51. What is the difference between System.String and System.StringBuilder classes?