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.NET / C# Interview Questions with Answers. (Udemy.com)

.NET / C# Interview Questions with Answers. Crack you next Csharp interview or .NET Interview with confidence.

4.6
3,297 reviews

Created by: Shivprasad Koirala

Last updated January 2025

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What you will 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,LIFO,FIFO, 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 and how to answer their differences
  • Dedicated OOP Interview section covering Classes , Objects , Polymorphism , Inheritance , virtual methods,overloading ,overriding ,abstract class vs interfaces

How it compares

Against the other 194 rated Udemy courses in C# on CourseDuck:

  • Rating4.6 out of 5higher than 76% of them
  • Reviews3,297#18 of 195 by number of reviews
  • Length9.2 hourslonger than 67% of them
  • Last updatedJanuary 2025more recently than 71% of them

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Course 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 during interview 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.

Part 1 - Stack, Heap, Boxing, Unboxing, Array, ArrayList, Generics, Threading
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 ?

Part 2 - Questions on Delegates, Event and 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 a Event ?
Question 35  :- How to create a event ?
Question 36  :- Delegate vs Events.

Part 3 - OOP, Abstraction, Encapsulation, Inheritance, Overriding & 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 ?

Part 4 - Polymorphism, Static vs Dynamic polymorphism and operator overloading.
Question 46 :- What is polymorphism ?
Question 47 :- Can polymorphism work with out inheritance ?
Question 48 :- Explain static vs dynamic polymorphism ?
Question 49 :- Explain operator overloading ?

Part 5 - Tricky Questions around Abstract classes and Interfaces.
Question 50  :- Why do we need Abstract classes ?
Question 51  :- Are Abstract methods virtual ?
Question 52  :- Can we create a instance of Abstract classes ?
Question 53  :- Is it compulsory to implement Abstract methods ?
Question 54  :- Why simple base class replace Abstract class ?
Question 55  :- Explain interfaces and why do we need it ?
Question 56  :- Can we write logic in interface ?
Question 57  :- Can we define methods as private in interface ?
Question 58  :- If i want to change interface what's the best practice ?
Question 59  :- Explain Multiple inheritance in Interface ?
Question 60  :- Explain Interface Segregation principle ?
Question 61  :- Can we create instance of interface ?
Question 62  :- Can we do Multiple inheritance with Abstract classes ?

Part 6 - Answering the most asked Question "Abstract classes vs Interface".
Question 63 :- Difference between Abstract Class & Interfaces?

Part 7 - Questions around constructors & parent child constructor.
Question 64  :- Why do we need constructors ?
Question 65  :- In parent child which constructor fires first ?
Question 66  :- How are initializers executed ?
Question 67  :- How are static constructors executed in Parent child ?
Question 68  :- When does static constructor fires ?

Part 8 - Questions around Shadowing, Sealed, Nested classes and partial classes.
Question 69 :- What is Shadowing?
Question 70 :- Explain method hiding?
Question 71 :- Shadowing vs Overriding ?
Question 72 :- When do we need Shadowing ?
Question 73 :- Explain Sealed Classes ?
Question 74 :- Can we create instance of sealed classes ?
Question 75 :- What are nested classes and when to use them ?
Question 76 :- Can Nested class access outer class variables ?
Question 77 :- Can we have public, protected access modifiers in nested class ?
Question 78 :- Explain Partial classes ?
Question 79 :- In What scenarios do we use partial classes ?

Part 9 - Questions Around SOLID principles , Dependency injection (DI) and IOC
Question 80 :- What is SOLID ?
Question 81 :- What is the full form of SOLID ?
Question 82 :- What is the goal of SOLID ?
Question 83 :- Explain SRP with A example ?
Question 84 :- What is the benefit of SRP ?
Question 85 :- Explain OCP with a example ?
Question 86 :- What is the  benefit of OCP ?
Question 87 :- Can you explain LISKOV Principle and it's violation?
Question 88 :- How can we fix LISKOV Problem ?
Question 89 :- Explain Interface Segregation Principle ?
Question 90:- Is there a connection between LISKOV and ISP ?
Question 91 :- Define dependency inversion ?
Question 92 :- What is higher level module and lower level module ?
Question 93 :- How does dependency inversion benefit, show with an example ?
Question 94 :- Will only Dependency inversion solve decoupling problem ?
Question 95 :- Why do developers  move object creation outside high lever module ?
Question 96 :- Explain IOC ( Inversion of Control) ?
Question 97 :- Explain Dependency Injection with an example ?
Question 98 :- Is SOLID, IOC and DI design pattern or Principle?
Question 99 :- Is only SOLID Enough for good code/ architecture ?
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Instructor Details

Shivprasad Koirala

My name is Shivprasad Koirala, We love teaching and learning, We started the QuestPond website 15 years back with the one single goal of creating quality step by step IT programming related lessons.

We saw many lessons online, either they are done too fast or too slow or are too complicated.

The main goal of Questpond is to create Step by Step lessons on C#, ASP.NET , Design  patterns , SQL and so on. As years moved on i added other step by step lessons like Angular , Sharepoint , MSBI, Azure and so on.

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Reviews

4.6

3,297 ratings on Udemy

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By Dhaval Rathod on 4/9/2026

⭐ 5/5 – Absolutely Outstanding Course! Shivprasad Koirala has done a phenomenal job with this course. His teaching style is crystal clear, engaging, and highly practical. Every topic is demonstrated with real-time examples, making even complex concepts easy to understand and apply. The explanations are detailed yet simple, and the hands-on approach truly helps in building confidence. You can feel the depth of his experience in every lecture. Overall, it’s an awesome learning experience — one of the best courses I’ve taken on Udemy. Highly recommended for anyone who wants to learn the subject thoroughly and effectively!

By pushpendra kataria on 1/23/2026

I recently completed the C# interview questions training course by Shiv Prasad, and it was an excellent learning experience. Shive Prasad has a strong technical command over C# concepts, and his teaching style is very clear and structured. He explains every topic with practical examples, which makes even complex concepts easy to understand. His way of delivering the content keeps you engaged, and the examples he uses help in connecting theory with real-world scenarios. Overall, this course is highly valuable for anyone preparing for C# interviews. I would definitely recommend it to learners at all levels.

By Avinash M on 11/25/2025

Hi, The overall course is very good for learning and interview preparation. The detailed explanations and in-depth analysis are commendable. I have completed the course, and it is definitely worth it. One thing I noticed is that the content on interfaces is outdated. I request that it be updated with the latest C# features and, if possible, that more topics be added.

By Anonymized User on 10/11/2025

If Anyone have good C# coding knowledge, than he only have to watch these videos to crack interview based on C#, dotnet etc. I am currently working in WIPRO and have given 30+ interviews, some of them like LTI Mindtree, CapGemini, Infosys, Mphasis, Accenture, Meta( account level only), EY, KPMG, Bastian, Quest Global, Neosoft, Zensar and many more, and this videos helped me answer all questions, only barrier was C# coding and forgetting some syntaxes in which case, I wasn't selected in many but cracked Infosys, Accenture, Capgemini, Cogentnext etc with help of these videos. Accenture didn't asked me coding question because of my knowledge based on these videos. So, I am already selected in that with very good hike. Thanks again. Om Namah Shivay, Paar Shiv hi Lagaenge. Wo Mahadev hon ya Koirala

By Vivek Bannur Siddappa on 8/24/2025

Shivprasad Koirala's C# Interview Questions and Answers course is outstanding. He explains every concept with clarity, real-world examples, and simple demos that make even complex topics easy to grasp. From OOP principles, SOLID, DI/IoC, and design patterns to advanced .NET internals, each explanation is precise and practical. What makes this course stand out is the balance of theory with hands-on code demos—you don’t just learn definitions, you see concepts in action. Shiv has put in tremendous effort to cover a wide range of interview scenarios, and his teaching style makes the material both engaging and memorable. This is by far one of the best resources for C# and .NET interview preparation, and I’d highly recommend it to anyone serious about leveling up their skills. A must-have course for developers preparing for interviews!

By Ritesh Kumar on 7/22/2025

In his effort to provide straightforward answers to common interview questions, Shivprasad sir has provided some of the clearest and most concise definitions for common programming terms that I've ever seen. Most of the programming terms, couched as interview questions, will be things that you're familiar with, but his definitions and examples help to clarify and solidify the concepts.

By Ganesh Durai on 6/16/2025

Should have covered the Clean Architecture and Design patterns in depth and expected more experienced technical interview preparation samples

By Andres Amortegui Martinez on 12/6/2024

It's a very very usefull course to practice an learn about differences between some concepts. Although, my native language is not english and sometimes this theorical information is complicated, it was very clear the explanation that the teacher gave. I'll be waiting the next sections and while I'll practice and review some of the previous topics. Just to give some advice, if the professor gets confused when explaining a definition, it would be good if he could repeat the definition he got entangled in to avoid confusion as a conclusion to the explanation he is giving at the moment. Again, this course is very recommended.

By Yavor Ivanov on 2/5/2024

The course is very good, I really liked it. Very good examples and explanations. I give the course close to the max just because I love the pdf file provided, where you can quickly go and refresh your knowledge. This is one of the drawbacks of the courses without such a file, you have to spend too much time just to refresh. Improvements that I think should be done: - The pdf has to be updated to include all the topics – also events & delegates, interfaces and so on. - I think the author has to redo the section for events and delegates, it needs better definitions and better examples, and when I compare it with his other sections, it is somehow not so good. - In part 12 he uses the word undetermestically – this wording has to be fixed; I think it is wrong. Better use nondeterministically or simply non-deterministic.

By Dariusz G on 3/23/2023

Very good talented teacher. The half star lack to the excellent is because: - a bit chaotic structure (could be more chapters divided by subtopics etc) - sometimes screen wasn't well prepared (text covered the code etc). - it is a pitty that multithreading questions are not yet prepared as they ask me about it every interview, but anyway there was lot of useful content Overall I am very satisfied. The teaching skill is awesome.

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Overall Score : 92 / 100

.NET / C# Interview Questions with Answers.
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  • Video Duration: icon 9.2h
  • Price: $74.99
  • Provider: icon Udemy
  • Updated: icon January 2025
  • Level: All Levels All Levels
  • Language: icon English
  • Certificate: icon Yes
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