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C#: namespace

Handbook C# · Practical Guide

Organizes types and prevents name conflicts. You can use a block or file-scoped declaration.

Simple example (Example.cs)

Save this example separately as Example.cs. Run it independently of the other examples on this page.

Example.cs:

// PROJECT-EXAMPLE
namespace MyTools;
class Item { public string Name => "Ore"; }

Declaration only: this code compiles as a library; call it from Main to run it.

Syntax

namespace Name { ... } / namespace Name;

Example 1: simple form

using System; namespace GameTools { public static class Program { public static void Main() { Console.WriteLine(typeof(Program).FullName); } } }

Example 2: another practical form

using System; namespace MyTools; public static class Program { public static void Main() { Console.WriteLine(typeof(Program).Namespace); } }

Official source: Microsoft Learn.