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Components
·Because C# classes are reference types, they expose no physical implementation detail to a client.  What the client creates on its stack frames are simply handles to the class implementations.
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–The compiler does type checking for a client from metadata in an accessed assembly.
–No header file is included, so the client is not dependent on implementation details of the class.
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–Consequently, any C# library dll can serve as a component for local access.
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–To make a component remotely accessible, you need to derive from System.MarshalByRefObject