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:: Operator (C# Reference)

The namespace alias qualifier operator.

The namespace alias qualifier (::) is used to look up identifiers. It is always placed between two identifiers, as in this example:

global::System.Console.WriteLine("Hello World");

The namespace alias qualifier can be global. This invokes a lookup in the global namespace, rather than an aliased namespace.

For an example of using the :: operator, see the following section:

For more information, see the following sections in the C# Language Specification:

  • 20.9.5 Simple names

  • 25.3 Namespace alias qualifiers

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