9. Namespaces
C# programs are organized using namespaces. Namespaces are used both as an “internal” organization system for a program and as an “external” organization system—a way of presenting program elements that are exposed to other programs.
Using directives (§9.4) are provided to facilitate the use of namespaces.
9.1 Compilation Units
A compilation-unit defines the overall structure of a source file. A compilation unit consists of zero or more using-directives followed by zero or more global-attributes followed by zero or more namespace-member-declarations.
compilation-unit: extern-alias-directivesopt using-directivesopt global-attributesopt namespace-member-declarationsopt
A C# program consists ...
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