C# Language. W3Schools lessons in English

Ua Es De

C# Comments

C# Comments

Comments can be used to explain C# code, and to make it more readable. It can also be used to prevent execution when testing alternative code.

Single-line Comments

Single-line comments start with two forward slashes (//).

Any text between // and the end of the line is ignored by C# (will not be executed).

This example uses a single-line comment before a line of code:


// This is a comment
Console.WriteLine("Hello World!");

Try it Yourself »

This example uses a single-line comment at the end of a line of code:


Console.WriteLine("Hello World!");  // This is a comment

Try it Yourself »

C# Multi-line Comments

Multi-line comments start with /* and ends with */.

Any text between /* and */ will be ignored by C#.

This example uses a multi-line comment (a comment block) to explain the code:


/* The code below will print the words Hello World
to the screen, and it is amazing */
Console.WriteLine("Hello World!");

Try it Yourself »

Single or multi-line comments?

It is up to you that you want to use. Normally, we use // for short comments, and /* */ for longer.

C# Exercises

Test Yourself With Exercises


Insert the missing parts to create two types of comments.

 This is a single-line comment
 This is a multi-line comment 

TOP-10 most popular extensions for Visual Studio Code used when programming in the C# language:

  • C# - is an official C# development extension from Microsoft. It provides support for IntelliSense, refactoring, debugging, and more.
  • C# Dev Kit - the C# Dev Kit helps you manage your code with Solution Explorer and test your code with integrated discovery and unit test execution, improving your C# development experience wherever you want to develop (Windows, macOS, Linux, and even in Codespace).
  • C# XML Documentation Comments - is an extension that adds support for XML comments for documenting C# code.
  • C# Snippets - this extension for Visual Studio Code adds code snippets for C# to help speed up the code writing process.
  • C# Extensions - is an extension that provides advanced C# development capabilities, including support for .NET Core and ASP.NET Core.
  • Auto-Using for C# - is an extension that automatically imports and provides intellisense for references that have not yet been imported into a C# file.
  • C# Namespace Autocompletion - is an extension that does full namespace autocompletion for C#.
  • NuGet Package Manager - this extension makes it easy to install and manage NuGet packages.
  • Unity - is an extension that allows you to debug Unity code in Visual Studio Code.
  • Code Runner - is an extension that allows you to execute C# code directly from Visual Studio Code.
  • CSharpier - Code formatter - is an extension that automatically formats C# code according to established rules.

Information provided by ChatGPT