Notice all the green text in the code below? Those are comments.

using System; public class Program { ...

Comments are a critical part of any program. They let you place free form text in your code. This is important so you can:

• Document what your code is doing
• Make notes of things to fix
• Document when changes are made and who made them
• Add documentation to be used by other development components

In C# there are several ways to add comments to code.

Single-line comments

You can comment out an entire line by placing // before the text you wish to be a comment.

//Console.WriteLine("Hello World");

Or

Console.WriteLine("Hello World"); // This is a comment after some code.

 

Multi-line comments

Multi-line comments, or comment blocks are used to comment out any number of sequential lines. Everything between /* and */ becomes a comment.

/*
    This is a comment.
    So is this.
    And even this.
*/

 

Visual Studio and .NET Fiddle Shortcuts

In Visual Studio, you can comment and uncomment links of code using the toolbar.

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Both Visual Studio and .NET Fiddle provide easy-to-use shortcuts for creating and removing comments: