Namespaces
 | As I mentioned earlier, the .NET Framework is composed of classes—many classes. Namespaces are the method used to create a hierarchical structure of all these classes and they help prevent naming collisions. A naming collision occurs when two classes have the same name. Because namespaces provide a hierarchy, it's possible to have two classes with the same name, as long as they exist in different namespaces. Namespaces, in effect, create a scope for classes. |
The base namespace in the .NET Framework is the System namespace. The System namespace contains classes for garbage collection (discussed shortly), exception handling, data typing, ...
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