51 c# Interview Questions And Answers 2024

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 the benefit of ‘using’ statement in C#?
8. What is serialization?
9. Can “this” command be used within a static method?
10. Differentiate between Break and Continue Statement.
11. List the different types of comments in C#.
12. Explain the four steps involved in the C# code compilation.
13. Discuss the various methods to pass parameters in a method.
14. Name all the C# access modifiers.
15. Mention all the advantages of C#.
16. Mention the important IDEs for C# development provided by Microsoft.
17. Why do we use C# language?
18. Mention the features of C# briefly.
19. What is meant by Unmanaged or Managed Code?
20. What is meant by an Abstract Class?
21. Differentiate between finalize blocks and finalize.
22. What is meant by an Interface?
23. What is meant by a Partial Class?
24.  What is the difference between read-only and constants?
25. What is an interface class? 
26.  What are User Control and Custom Control?
27. What are reference types and value types?
28. What are sealed classes in C#?
29. What is method overloading?
30. What is the difference between Arraylist and Array?
31.  Is it possible for a private virtual method to be overridden?
32. Describe the accessibility modifier “protected internal”.
33. What are the differences between System.String and System.Text.StringBuilder classes?
34.  What’s the difference between the System.Array.CopyTo() and System.Array.Clone() ?
35. How can the Array elements be sorted in descending order?
36. What’s the difference between an abstract and interface class?
37. What is the difference between Dispose() and Finalize()methods?
38. What are circular references?
39. What are generics in C# .NET?
40. What is an object pool in .NET?
41. List down the most commonly used types of exceptions in .NET
42. What are Custom Exceptions?
43. What are delegates?
44. What is the difference between method overriding and method overloading?
45. How do you inherit a class into another class in C#?
46.  What are the various ways that a method can be overloaded?
47. Why can’t the accessibility modifier be specified for methods within the interface?
48. How can we set the class to be inherited, but prevent the method from being overridden?
49. What happens if the method names in the inherited interfaces conflict?
50. What is the difference between a Struct and a Class?
51. How to use nullable types in .Net?

c# Interview Questions And Answers

1. What is C#?

Ans.C# (pronounced C sharp) is a programming language developed by Microsoft. It is part of the .NET framework and is commonly used for building Windows applications, web applications, and other types of software.

2.Difference Between static, public, and void:

Ans.

• Static:
  • Indicates that a member belongs to the class rather than an instance of the class.
• Public:
  • Access modifier that makes a member (variable, method, etc.) accessible from any other class.
• Void:
  • Denotes a method that does not return any value.

3.What is an Object?

Ans.

• An object is an instance of a class in object-oriented programming. It is a self-contained unit that consists of data and behavior, following the blueprint defined by its class.

4,Define Constructors:

Ans.

• Constructors are special methods in a class that are called when an object of the class is created. They initialize the object’s state and are used to set values to the properties or perform other setup tasks.

5.Jagged Arrays:

Ans.

• Jagged arrays are arrays of arrays where each element can be an array of different sizes. In a jagged array, each sub-array can have a different length.

6.Difference Between out and ref Parameters:

Ans.

• Both out and ref parameters allow a method to modify the values of variables outside the method.
• The key difference is that ref requires the variable to be initialized before passing it to the method, whereas out does not.

7.Benefit of ‘using’ Statement in C#:

Ans.

• The using statement is used for resource management, especially with objects that implement the IDisposable interface. It ensures that the resource is properly disposed of when it goes out of scope, reducing memory leaks and improving code readability.

8.Serialization:

Ans.

• Serialization is the process of converting an object into a format that can be easily persisted or transmitted, such as JSON, XML, or binary format. It allows objects to be stored, sent over a network, or reconstructed later.

9.Can “this” Command Be Used Within a Static Method?

Ans.

• No, the “this” keyword refers to the current instance of the class, and static methods do not have access to instance-specific data. It can only be used in non-static (instance) methods.

10.Difference Between Break and Continue Statement:

Ans.

• Break:
  • Terminates the nearest enclosing loop or switch statement.
• Continue:
  • Skips the rest of the loop’s code and proceeds to the next iteration of the loop.

FAQ- 51 c# Interview Questions And Answers 2024