Visual Studio .net FAQ's

How are namespaces different from assemblies?

An assembly is a physical grouping of the source code and resource files that is stored into some file(s). A namespace, on the other hand, is a logical grouping of related types which not necessarily reside into same assembly. A namespace may contain sub or child namespaces while there is not concept of child or sub assemblies (module is something different from child namespace, as modules are integral and necessary parts of an assembly). An assembly not only contains the source code, it also contains manifest, version information (optional public key token) and culture information. A program may reference two or more assemblies with the same name (but with different versions) but a program can not contain two namespaces with the same name.

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