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40 interview questions on C# - Fundamentalsfor developers (2026)

Test your technical skills before an interview of C# - Fundamentals with 40 corrected questions. Beginner, Intermediate or Expert level.

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40 questions
Easy
7 votes1127 runs1 comment

Write a C# class with a private int age field and getter and setter methods for it.

Back-end developer
access
field
Anonymous authorat Mar 16, 2022
Easy
6 votes1077 runs0 comment

Simple inheritance between a parent class and a child class in C#

Back-end developer
inheritance
classes
Anonymous authorat Mar 16, 2022
Medium
4 votes1198 runs
1 comment

An event in an ASP.NET application:

Back-end developer
asp.net
controller
Anonymous authorat Mar 16, 2022
Easy
4 votes391 runs
1 comment

Initialize a new Vehiclue object containing a string field in C#

Back-end developer
classes
objects
Auroreat Aug 30, 2024
Medium
2 votes1099 runs
2 comments

The PFX Framework:

Back-end developer
multithreading
parallelization
c#
Anonymous authorat Mar 16, 2022
Easy
2 votes1050 runs0 comment

How to declare a SortedList<Key,Value> in C#

Back-end developer
collections
generics
Anonymous authorat Mar 9, 2023
Hard
2 votes1013 runs0 comment

Write a C# function that displays a matrix.

Back-end developer
arrays
loops
Anonymous authorat Mar 25, 2022
Easy
2 votes384 runs0 comment

What is the new syntax for creating an object in C# 9.0?

Back-end developer
object initializer
Auroreat Aug 30, 2024
Hard
2 votes272 runs0 comment

What is a property in C#?

Back-end developer
properties
methods
fields
Anonymous authorat Jan 30, 2025
Medium
1 vote377 runs0 comment

What is an ASPX file?

Back-end developer
asp.net
c#
html
Auroreat Aug 30, 2024
Easy
1 vote318 runs0 comment

Choose the two correct answers:

Back-end developer
arrays
variables
Anonymous authorat Mar 16, 2022
Hard
0 vote1064 runs
1 comment

In C#, a thread:

Back-end developer
c#
thread
asynchronous
Anonymous authorat Mar 16, 2022
Medium
0 vote1062 runs1 comment

How to deploy an ASP.NET application

Back-end developer
config
deployment
Anonymous authorat Mar 16, 2022
Hard
0 vote1029 runs
3 comments

Write the constructors of a public class Platane that includes a protected int nb_branche field and inherits from a public Arbre class including the protected string type_arbre field.

Back-end developer
constructors
inheritance
Anonymous authorat Aug 23, 2024
Medium
0 vote990 runs0 comment

About objects of type List<T>:

Back-end developer
list
sort
add
Anonymous authorat Mar 16, 2022
Easy
0 vote976 runs2 comments

In a derived class: We must implement the methods of an abstract parent class in the derived classes, You can override a predefined method with the virtual attribute in the parent class

Back-end developer
inheritance
abstract
Anonymous authorat Jan 30, 2023
Easy
0 vote898 runs0 comment

Write a C# program that prints 6WeLoveDevs to the console.

Back-end developer
console
strings
Anonymous authorat Mar 25, 2022
Easy
0 vote718 runs1 comment

Lists in C#:

Back-end developer
list
c#
Yona Eisenbergat Mar 28, 2023
Easy
0 vote682 runs0 comment

About interfaces in C#

Back-end developer
interfaces
Anonymous authorat Mar 16, 2022
Medium
0 vote559 runs0 comment

Windows Presentation Foundation (WPF) :

Back-end developer
gui
xaml
c#
Anonymous authorat Mar 16, 2022