✅ Introduction
Are you preparing for a C sharp developer job as a fresher? Whether you’re applying for an internship or entry-level developer role, being ready with essential C sharp interview questions can make all the difference.
C sharp (C #) is a powerful object-oriented language developed by Microsoft. It’s commonly used for desktop apps, web services, games with Unity, and enterprise software.
✅ Section 1: Basic C sharp Interview Questions for Freshers
1. What is C#?
- Answer: C# is a modern, object-oriented programming language developed by Microsoft for building Windows applications, web apps, games, and services.
2. What are the key features of C#?
Type-safe
Object-oriented
Automatic garbage collection
Rich standard library
Interoperability with .NET
3. What is the difference between value type and reference type?
Value types: Store data directly (e.g.,
int,float)Reference types: Store reference to data (e.g.,
class,string)
4. What is the use of using statement in C#?
- It is used to import namespaces or for resource management (e.g., disposing objects).
5. What are access modifiers in C#?
public,private,protected,internal, and combinations likeprotected internal.
✅ Section 2: Object-Oriented Programming in C sharp
6. What is a class and an object in C#?
Class is a blueprint; object is an instance of a class.
7. What is inheritance?
- Inheritance allows a class to acquire properties and methods of another class using
:.
8. What is method overloading vs overriding?
Overloading: Same method name with different parameters
Overriding: Redefining a method in a derived class
9. What is an abstract class?
- A class that cannot be instantiated. It can contain abstract and non-abstract members.
10. What is an interface?
- An interface defines a contract. All members are abstract and must be implemented.
✅ Section 3: C sharp Coding Interview Questions
11. Write a program to reverse a string.
string input = "Freshy";
char[] arr = input.ToCharArray();
Array.Reverse(arr);
Console.WriteLine(new string(arr));
12. How to find even numbers from an array using LINQ?
int[] numbers = { 1, 2, 3, 4, 5 };
var evens = numbers.Where(n => n % 2 == 0);
13. How to handle exceptions in C#?
try {
int x = 10 / 0;
} catch (DivideByZeroException ex) {
Console.WriteLine(ex.Message);
}
14. Write a factorial program using recursion.
int Factorial(int n) => (n == 0) ? 1 : n * Factorial(n - 1);
15. How to define a custom exception?
public class MyException : Exception {
public MyException(string message) : base(message) {}
}
✅ Section 4: Advanced C sharp Interview Questions
16. What is boxing and unboxing?
Boxing: Converting value type to object
Unboxing: Converting object back to value type
17. What is the difference between ref and out parameters?
refrequires initialization before passingoutdoesn’t need initialization before being passed
18. What is garbage collection in C#?
- Automatic memory management that reclaims unused memory.
19. Explain delegates and events in C#.
Delegates: Pointers to methods
Events: Notifications sent by objects
20. What is a nullable type?
- Allows value types to hold
nullusing?, e.g.,int? age = null;
✅ Section 5: Miscellaneous C sharp Interview Questions
21. Difference between StringBuilder and String?
Stringis immutable;StringBuilderis mutable and better for repeated concatenations.
22. What is the difference between == and Equals()?
==checks for reference or value (depending on override);Equals()checks content.
23. What is async and await in C#?
- Keywords used for asynchronous programming, enabling non-blocking operations.
24. What are static classes?
- Classes that cannot be instantiated and can only contain static members.
25. What is a namespace?
- Used to organize code and avoid naming conflicts.
✅ 10 Real-World C# Code Examples
Calculate the sum of an array
Print Fibonacci series
Sort an array
Check if a string is a palindrome
Convert Celsius to Fahrenheit
Find duplicate elements in an array
Create a basic calculator app
Create a login validation system
CRUD operations using a list
Implement a custom exception handler
✅ FAQs – C# Interview Questions for Freshers
Q1. Is C# good for freshers to start a career?
- Answer: Yes, it’s widely used in enterprise development and has excellent support through the .NET ecosystem.
Q2. What are the most commonly asked C# topics in interviews?
- Answer: OOP concepts, syntax, collections, exception handling, and basic coding.
Q3. Should I learn ASP.NET for a C# interview?
- Answer: It’s helpful, especially for web development roles, but not mandatory for all C# positions.
Q4. Are data structures asked in C# interviews?
- Answer: Yes, especially lists, dictionaries, stacks, and queues.
Q5. Can I use C# for web development?
- Answer: Absolutely. C# is widely used in web development via ASP.NET.
✅ Conclusion
Mastering the right C sharp interview questions is a stepping stone to launching your developer career. As a fresher, your goal should be to understand the core concepts, object-oriented principles, and basic coding patterns in C#. This guide has covered 25 essential questions, real-world examples, and answers to help you gain confidence and clarity.
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.
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