:: Operator (C# Reference)
Visual Studio 2005
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");
For more information, see the following sections in the C# Language Specification:
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20.9.5 Simple names
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25.3 Namespace alias qualifiers