C# Interview Questions with Answers

C# Interview Questions & Answers

• Question 1 :- Explain difference between .NET and C# ?
• Question 2 :- .NET Framework vs .NET Core vs .NET 5.0
• Question 3 :- What is IL ( Intermediate Language) Code ?
• Question 4 :- What is the use of JIT ( Just in time compiler) ?
• Question 5 :- Is it possible to view IL code ?
• Question 6 :- What is the benefit of compiling in to IL code ?
• Question 7 :- Does .NET support multiple programming languages ?
• Question 8 :- What is CLR ( Common Language Runtime) ?
• Question 9 :- What is managed and unmanaged code ?
• Question 10 :- Explain the importance of Garbage collector ?
• Question 11 :- Can garbage collector claim unmanaged objects ?
• Question 12 :- What is the importance of CTS ?
• Question 13 :- Explain CLS ?
• Question 14 :- Difference between Stack vs Heap ?
• Question 15 :- What are Value types & Reference types?
• Question 16 :- Explain boxing and unboxing ?
• Question 17 :- What is consequence of boxing and unboxing ?
• Question 18 :- Explain casting,implicit casting and explicit casting ?
• Question 19 :- What can happen during explicit casting ?
• Question 20 :- Differentiate between Array and ArrayList ?
• Question 21 :- Whose performance is better array or arraylist ?
• Question 22 :- What are generic collections ?
• Question 23 :- What are threads (Multithreading)?
• Question 24 :- How are threads different from TPL ?
• Question 25 :- How do we handle exceptions in C#(try/catch)?
• Question 26 :- What is the need of finally?
• Question 27 :- Why do we need the out keyword ?
• Question 28 :- What is the need of Delegates ?
• Question 29 :- What are events ?
• Question 30 :- Whats the difference between Abstract class and interface ?

C# Interview Questions & Answers - Part 2.

• Question 31 :- What is a Multicast delegates ?
• Question 32 :- What is a Event ?
• Question 33 :- How to create a event ?
• Question 34 :- Delegate vs Events.

C# Interview Questions & Answers - Part 3.

• Question 37 :- What is a class and object ?
• Question 38 :- Abstraction vs Encapsulation?
• Question 39 :- Explain Inheritance ?
• Question 40 :- Explain virtual keyword ?
• Question 41 :- What is overriding ?
• Question 42 :- Explain overloading ?
• Question 43 :- Overloading vs Overriding ?

C# Interview Questions & Answers - Part 4.

• 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 ?

C# Interview Questions & Answers - Part 5.

• 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 what's 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 ?

C# Interview Questions & Answers - Part 6.

• Question 61 :- This video is covering question and answer on differentiate between Abstract Class and Interface in C#.

C# Interview Questions & Answers - Part 7.

• 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 ?

C# Interview Q&A PDF

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