Top 50 Most Asked C# Programs for Freshers to Experienced Candidates
These programs are commonly asked in C# interviews for:
Freshers
Junior Developers
Mid-Level Developers
Experienced .NET Developers
They cover:
Basics
OOP
Arrays & Strings
Collections
LINQ
File Handling
Exception Handling
Multithreading
Advanced C#
Basic C# Programs
1. Hello World Program
Console.WriteLine("Hello World");
2. Swap Two Numbers
3. Find Even or Odd Number
4. Find Largest of Three Numbers
5. Check Leap Year
6. Reverse a Number
7. Palindrome Number
8. Armstrong Number
9. Prime Number Check
10. Fibonacci Series
String Programs
11. Reverse a String
string str = "hello";
char[] arr = str.ToCharArray();
Array.Reverse(arr);
Console.WriteLine(new string(arr));
12. Check Palindrome String
13. Count Vowels and Consonants
14. Find Duplicate Characters in String
15. Remove Duplicate Characters
16. Count Words in String
17. Find First Non-Repeated Character
18. Check Anagram Strings
19. String Compression Program
20. Find Frequency of Characters
Array Programs
21. Find Largest Element in Array
22. Find Second Largest Number
23. Sort Array in Ascending Order
24. Bubble Sort Program
25. Binary Search Program
26. Linear Search Program
27. Remove Duplicates from Array
28. Merge Two Arrays
29. Find Missing Number in Array
30. Rotate Array
OOPs Programs
31. Class and Object Example
class Student
{
public string Name;
public void Display()
{
Console.WriteLine(Name);
}
}
32. Inheritance Example
33. Polymorphism Example
34. Method Overloading
35. Method Overriding
36. Encapsulation Example
37. Abstraction Example
38. Interface Example
39. Constructor and Destructor
40. Singleton Design Pattern
Collections & LINQ Programs
41. List Example
List<int> numbers = new List<int>() {1,2,3};
42. Dictionary Example
43. Stack Implementation
44. Queue Implementation
45. Find Duplicate Elements Using LINQ
var duplicates = numbers.GroupBy(x => x)
.Where(g => g.Count() > 1)
.Select(y => y.Key);
46. Sort List Using LINQ
47. Filter Data Using LINQ
48. Lambda Expression Example
49. Delegate and Event Program
50. Async Await Example
public async Task GetData()
{
await Task.Delay(1000);
Console.WriteLine("Completed");
}
Most Asked Advanced C# Interview Programs
These are highly important for experienced candidates:
CRUD Operations using ADO.NET
Entity Framework CRUD
Dependency Injection
Repository Pattern
Unit of Work Pattern
Multithreading
Deadlock Example
Producer Consumer Problem
File Upload Program
API Calling using HttpClient
JWT Authentication
Reflection Example
Serialization & Deserialization
Generic Class Example
Extension Methods
Middleware Example in ASP.NET Core
Most Important Topics for Freshers
Focus on these first:
Strings
Arrays
OOP Concepts
Collections
Exception Handling
Delegates
LINQ
Async/Await
File Handling
SQL + C# Integration
Common Interview Follow-Up Questions
Interviewers may ask:
Time Complexity
Difference between Array and List
IEnumerable vs IQueryable
Abstract Class vs Interface
Ref vs Out vs In
String vs StringBuilder
Task vs Thread
Async vs Parallel
Boxing vs Unboxing
Dispose vs Finalize
Recommended Preparation Roadmap
Beginner
Basic Programs
Loops
Arrays
Strings
Intermediate
OOP
Collections
Exception Handling
LINQ
Advanced
ASP.NET Core
Entity Framework
Multithreading
Design Patterns
Web APIs
Authentication
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