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OOPS interview questions and answers:- https://youtu.be/u99wAoBjDvQ
Following are the questions covered in this C# Q&A Series :-
– Questions on Stack, Heap, Boxing, Unboxing, Array, ArrayList, Generics, Threading.
02:34 Question 1 :- Explain difference between .NET and C# ?
06:44 Question 2 :- .NET Framework vs .NET Core vs .NET 5.0
15:08 Question 3 :- What is IL ( Intermediate Language) Code ?
15:08 Question 4 :- What is the use of JIT ( Just in time compiler) ?
17:03 Question 5 :- Is it possible to view IL code ?
18:14 Question 6 :- What is the benefit of compiling in to IL code ?
20:39 Question 7 :- Does .NET support multiple programming languages ?
22:52 Question 8 :- What is CLR ( Common Language Runtime) ?
24:10 Question 9 :- What is managed and unmanaged code ?
26:21 Question 10 :- Explain the importance of Garbage collector ?
28:11 Question 11 :- Can garbage collector claim unmanaged objects ?
28:33 Question 12 :- What is the importance of CTS ?
30:25 Question 13 :- Explain CLS ?
33:23 Question 14 :- Difference between Stack vs Heap ?
35:27 Question 15 :- What are Value types & Reference types?
36:15 Question 16 :- Explain boxing and unboxing ?
37:01 Question 17 :- What is consequence of boxing and unboxing ?
37:32 Question 18 :- Explain casting,implicit casting and explicit casting ?
39:37 Question 19 :- What can happen during explicit casting ?
40:48 Question 20 :- Differentiate between Array and ArrayList ?
43:12 Question 21 :- Whose performance is better array or arraylist ?
44:22 Question 22 :- What are generic collections ?
46:20 Question 23 :- What are threads (Multithreading)?
47:32 Question 24 :- How are threads different from TPL ?
52:47 Question 25 :- How do we handle exceptions in C#(try/catch)?
54:43 Question 26 :- What is the need of finally?
55:49 Question 27 :- Why do we need the out keyword ?
58:12 Question 28 :- What is the need of Delegates ?
58:45 Question 29 :- What are events ?
59:35 Question 30 :- Whats the difference between Abstract class and interface ?
– Questions on Delegates, Event & Delegates vs Events.
Question 31 – What is a Delegate and how to create a Delegate?
Question 32 – Where have you used Delegates?
Question 33 – What is a Multicast Delegates?
Question 34 – What is an Event?
Question 35 – How to Create an Event?
Question 36 – Delegate VS Events.
– Questions OOP, Abstraction, Encapsulation, Inheritance, Virtual, Overriding and overloading.
Question 37 :- Why do we need OOP ?
Question 38 :- What are the important pillars of OOPs ?
Question 39 :- What is a class and object ?
Question 40 :- Abstraction vs Encapsulation?
Question 41 :- Explain Inheritance ?
Question 42 :- Explain virtual keyword ?
Question 43 :- What is overriding ?
Question 44 :- Explain overloading ?
Question 45 :- Overloading vs Overriding ?
– Questions Polymorphism, Static vs Dynamic polymorphism and operator overloading.
Question 44 :- What is polymorphism ?
Question 45 :- Can polymorphism work with out inheritance ?
Question 46 :- Explain static vs dynamic polymorphism ?
Question 47 :- Explain operator overloading ?
– Tricky Questions around Abstract classes and Interfaces.
Question 48 :- Why do we need Abstract classes ?
Question 49 :- Are Abstract methods virtual ?
Question 50 :- Can we create a instance of Abstract classes ?
Question 51 :- Is it compulsory to implement Abstract methods ?
Question 52 :- Why simple base class replace Abstract class ?
Question 53 :- Explain interfaces and why do we need it ?
Question 54 :- Can we write logic in interface ?
Question 55 :- Can we define methods as private in interface ?
Question 56 :- If i want to change interface whats the best practice ?
Question 57 :- Explain Multiple inheritance in Interface ?
Question 58 :- Explain Interface Segregation principle ?
Question 59 :- Can we create instance of interface ?
Question 60 :- Can we do Multiple inheritance with Abstract classes ?
– Answering the most asked Question “Abstract classes vs Interface”.
Abstract Class vs interface interview questions and answers.
– Questions around constructors & in parent child which constructor fires first.
Question 62 :- Why do we need constructors ?
Question 63 :- In parent child which constructor fires first ?
Question 64 :- How are initializers executed ?
Question 65 :- How are static constructors executed in Parent child ?
Question 66 :- When does static constructor fires ?
– Questions around Shadowing, Sealed, Nested classes and partial classes.
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