Top 40 C# Interview Questions | 2026

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Basic C# Interview Questions & Answers
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1. What Is C#?
2. List Some Key C# Features.
3. What Are Classes in C#?
4. What Are Objects in C#?
5: Summarize the Different Class Types in C#.
6: Summarize the Four Access Modifiers in C#.
7: Summarize the Four Steps for Compiling C# Code.
8: What Is the Difference Between ‘Break’ & ‘Continue’ in C#?
9: Summarize the C# Keywords Used for Error Handling.
10: What Are Accessors in C#?
11: Demonstrate the Different Ways to Add Comments in C#.
12: What Are Static Declared Variables in C#?
13: What Are Value Types & Reference Types in C#?
14: What Are Namespaces in C#?

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Intermediate C# Interview Questions
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15: Why Would You Implement the ‘using’ Statement in C#?
16: What’s the Difference Between Dispose() and Finalize()?
17: What’s the Difference Between Boxing & Unboxing in C#?
18: Summarize the Options to Pass Parameters With Methods in C#.
19: How Do You Use Nullable Types in C#?
20: What Are C# Constructors?
21: What Is a C# Destructor?
23: What Is a Jagged Array in C#?
24: Summarize the Process of File Handling in C#
25: What Is an Interface Class in C#?
26: Describe the C# Struct Data Type.
27. What’s the Difference Between a Class and a Struct?

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C# Interview Questions for Experienced Professionals
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28: What’s the Difference Between Managed & Unmanaged Code?
29: What Is a Virtual Method in C#?
30: What is Reflection in C#?
31: What Is Serialization in C#?
32: Summarize Thread Pooling in C#.
33: Can You Use ‘this’ in a C# Static Method?
34: What Is Constructor Chaining in C#?
35: Summarize the Thread Lifecycle in C#.
36: Why Are Async and Await used in C#?
37: What Is an Indexer in C#?
38: What’s the Difference Between ‘ref’ and ‘out’ in C#?
39: What Is a Singleton in C#?
40: What Are C# Delegates?