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Please explain what you are really asking here. &nbsp;What are you trying to do. &nbsp;Because your question is Soooooooo broad that it sounds like it may be homework or for a course....
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Please explain what you are really asking here.  What are you trying to do.  Because your question is Soooooooo broad that it sounds like it may be homework or for a course....

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Please explain how API(s) can be written and then &nbsp;used in others modules. please use C# as an example ! thank s 
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Please explain how API(s) can be written and then  used in others modules. please use C# as an example ! thank s 

using API's for programming

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).