C# Interview Questions with Answers

C# Interview Questions and Answers tutorial

What you'll learn:
Understanding what kind of Fundamental questions are asked in C# and .NET interviews and how clear the same.
Answering fundamental C# questions around .NET core vs .NET framework vs .NET 5.0 , IL code , JIT,CTS,CLS,CLR, Managed , Unmanaged code and Garbage collector.
How to confidently answer questions around stack , heap , value types, reference types ,boxing , unboxing , implicit casting and explicit casting.
Threading and collections are favorites in C# interviews. A complete section dedicated to answer questions like array,arraylist,array vs arraylist and generics.
No C# interview is complete with out a question on delegates and events. A full section dedicated to delegates and events covering question on delegates , multicast delegates , events vs delegates and how to explain real time example of delegates and events.
Dedicated OOP Interview section covering Classes , Objects , Polymorphism , Inheritance , virtual methods, overloading , overriding , abstract class vs interfaces and multiple interfaces

Requirements
Should have knowledge of C#. Remember this is a interview preparation revision course and not short cut to easy jobs in C#.

Description
If you are looking to clear C# and .NET Interviews then you have landed at the right course. You can be a hero in your project/company , you must have handled complex scenarios.

But failing to answer simple .NET , C# Fundamental question can lead to a very negative impact during interviews.

This course focuses on Fundamental questions around C# and .NET… Happy job hunting.

Below is the list of C# interview questions covered in the Series.

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 :- What's 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 a Event ?
Question 35 :- How to create a event ?
Question 36 :- Delegate vs Events.
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 ?
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 ?
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 ?

Who this course is for
C# Developers who are looking for a job change and good prospects.
C# Developers who want to do last minute revision before going to interview.