Editing C preprocessor (section)

=== Region ===
The <code>#region</code> and <code>#endregion</code> directives in C# are used to expand/collapse sections of code in IDEs, and has no effect on actual compilation of the program. It is primarily used for code organisation and readability.
<syntaxhighlight lang="csharp">
#region Helper Methods

void Log(string message)
{
    Console.WriteLine(message);
}

#endregion
</syntaxhighlight>

This directive does not exist in C/C++.