C# Interview Questions and Answers
3+ Hours of Q&A Videos with Source Codes
Course Content
- 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 ?
- 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.
- 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 ?
- Question 46 :- Explain static vs dynamic polymorphism ?
- Question 47 :- Explain operator overloading ?
- 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 ?
- Question 61 :- Abstract Class vs interface interview questions and answers.
- 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 ?
- Question 70 :- What is Shadowing?
- Question 71 :- Explain method hiding?
- Question 72 :- Shadowing vs Overriding ?
- Question 73 :- When do we need Shadowing ?
- Question 74 :- Explain Sealed Classes ?
- Question 75 :- Can we create instance of sealed classes ?
- Question 76 :- What are nested classes and when to use them ?
- Question 77 :- Can Nested class access outer class variables ?
- Question 78 :- Can we have public,protected access modifiers in nested class ?
- Question 79 :- Explain Partial classes ?
- Question 80 :- In What scenarios do we use partial classes ?
- Question 81 :- What is SOLID ?
- Question 82 :- What is the full form of SOLID ?
- Question 83 :- What is the goal of SOLID ?
- Question 84 :- Explain SRP with A example ?
- Question 85 :- What is the benefit of SRP ?
- Question 86 :- Explain OCP with a example ?
- Question 87 :- What is the benefit of OCP ?
- Question 88 :- Can you explain LISKOV Principle and it's violation?
- Question 89 :- How can we fix LISKOV Problem ?
- Question 90 :- Explain Interface Segregation Principle ?
- Question 91 :- Is there a connection between LISKOV and ISP ?
- Question 92 :- Define dependency inversion ?
- Question 93 :- What is higher level module and lower level module ?
- Question 94 :- How does dependency inversion benefit, show with an example ?
- Question 95 :- Will only Dependency inversion solve decoupling problem ?
- Question 96 :- Why do developers move object creation outside high lever module ?
- Question 97 :- Explain IOC ( Inversion of Control) ?
- Question 98 :- Explain Dependency Injection with an example ?
- Question 99 :- Is SOLID, IOC and DI design pattern or Principle?
- Question 100 :- Is only SOLID Enough for good code/ architecture ?
- C# interview questions with answers PDF.
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