Top 25 C# Interview Questions Every Developer Should Know in 2025
C#
C# is a programming language designed by Microsoft. It is easy to learn and combines the strengths of C++ and Java, making it a flexible tool for various applications like desktop software, websites, mobile apps, and games (commonly with Unity). With features like automatic memory management and support for modern programming practices, C# is reliable for large-scale projects.C# is a user-friendly and efficient programming language, ideal for enterprise projects and game development. It excels in building reliable and high-performance applications across diverse industries.
1. What is C# ?
2. What is the difference between static, public, and void ?
3. What is an object ?
4. Define Constructors .
5. What are Jagged Arrays ?
6. What is the difference between out and ref parameters ?
7. What is serialization ?
8. Can “this” command be used within a static method ?
9. Differentiate between Break and Continue Statement.
10. List the different types of comments in C#.
11. What are the four steps involved in C# code compilation ?
12. Discuss the various methods to pass parameters in a method.
13. Name all the C# access modifiers.
14. Mention the advantages of C#.
15. Why do we use C# language ?
16. What is the difference between out and ref parameters ?
17. What is an Abstract Class ?
18. Differentiate between finalize blocks and finalize method.
19. What is an interface ?
20. What is the difference between Arraylist and Array ?
21. Describe the accessibility modifier “protected internal”.
22. What are the differences between System.String and System.Text.StringBuilder classes ?
23. What’s the difference between System.Array.CopyTo() and System.Array.Clone()?
24. What is the difference between Dispose() and Finalize() methods?
25. What are generics in C# .NET?
FAQs About C#
What is C# ?C# is a programming language developed by Microsoft. It is versatile and combines features of C++ and Java, making it suitable for creating desktop software, websites, mobile apps, and games.
Why is C# popular in game development ?C# is commonly used with the Unity game engine, making it a top choice for developing interactive and high-performance games.
What are the key features of C# ?C# offers automatic memory management, strong type-checking, and supports modern programming practices like asynchronous code.
Is C# suitable for large-scale projects ?Yes, C# is known for its reliability and efficiency, making it a preferred choice for enterprise applications and large-scale software development.
What industries use C# the most ?C# is widely used in enterprise software, web development, and game development due to its flexibility and performance.
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