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C#
Backend
C#
Curated C# interview questions with detailed answers.
30
questions
updated weekly
Junior
10
Middle
12
Senior
8
C# questions
30 / 30 shown
Default
Popular
Newest
›
What is C# and the .NET platform?
Junior
#Language
#Csharp
Details →
›
What is the difference between value and reference types?
Junior
#Language
#Csharp
Details →
›
How do you declare variables and use var?
Junior
#Language
#Csharp
Details →
›
How do strings work in C#?
Junior
#Language
#Csharp
Details →
›
What are the common collection types?
Junior
#Data Structures
#Csharp
Details →
›
What control-flow constructs does C# offer?
Junior
#Language
#Csharp
Details →
›
How do classes, constructors and properties work?
Junior
#Oop
#Csharp
Details →
›
How do methods, parameters and overloading work?
Junior
#Language
#Csharp
Details →
›
How do namespaces and using directives work?
Junior
#Language
#Csharp
Details →
›
What are nullable types and null-handling operators?
Junior
#Language
#Csharp
Details →
›
How do inheritance and polymorphism work?
Middle
#Oop
#Csharp
Details →
›
What are interfaces in C#?
Middle
#Oop
#Csharp
Details →
›
What are generics and constraints?
Middle
#Language
#Csharp
Details →
›
How does exception handling work?
Middle
#Error Handling
#Csharp
Details →
›
What are delegates and events?
Middle
#Language
#Csharp
Details →
›
What is LINQ?
Middle
#Functional
#Csharp
Details →
›
How does async/await work in C#?
Middle
#Async
#Csharp
Details →
›
What are records in C#?
Middle
#Language
#Csharp
Details →
›
What are extension methods?
Middle
#Language
#Csharp
Details →
›
What is the difference between an enum, a struct and a class?
Middle
#Language
#Csharp
Details →
›
How does memory management and garbage collection work in .NET?
Senior
#Performance
#Csharp
Details →
›
How do Tasks and parallelism work beyond async/await?
Senior
#Concurrency
#Csharp
Details →
›
How does dependency injection work in .NET?
Senior
#Architecture
#Csharp
Details →
›
What pattern matching does modern C# support?
Senior
#Language
#Csharp
Details →
›
How do Span<T> and Memory<T> improve performance?
Senior
#Performance
Details →
›
What is ASP.NET Core and its middleware pipeline?
Senior
#Framework
#Csharp
Details →
›
How does C# code execute (IL, JIT, AOT)?
Senior
#Performance
#Csharp
Details →
›
What is boxing and unboxing, and why does it matter?
Middle
#Performance
Details →
›
How do iterators and the yield keyword work?
Middle
#Language
#Csharp
Details →
›
What are reflection and attributes used for?
Senior
#Language
#Csharp
Details →
