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C#: global

Handbook C# · Practical Guide

The global:: qualifier starts the search from the root namespace; global using imports names into all project files.

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
global::System.Console.WriteLine("Root namespace");

Result:

Root namespace

Syntax

global::System.Console / global using Namespace;

Example 1: simple form

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

public static class Program
{
    public static async Task Main(string[] args)
    {
        global::System.Console.WriteLine("Root namespace");
    }
}

Example 2: another practical form

global using System;
public static class Program { public static void Main() { Console.WriteLine("Shared import"); } }

Official source: Microsoft Learn.