using (C# Reference)

The using keyword has two major uses:

  • As a directive, when it is used to create an alias for a namespace or to import types defined in other namespaces. See using Directive.

  • As a statement, when it defines a scope at the end of which an object will be disposed. See using Statement.

In addition, the using static directive lets you define a type whose static members you can access without specifying a type name.

See Also

C# Reference
C# Programming Guide
C# Keywords
Namespace Keywords
Namespaces
extern