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I would like to know how to allow my C# application to be used from others’ own applications.
Is making the relevant classes public enough for this purpose? Shall they be able to put a reference in their projects to my .exe and use my public classes freely? Shall they only be able to use it from .NET applications?
What else should I take into account? Any security issues maybe?
Your .Net dlls can be used by other .Net applications. You can separate the logic part of your code from the interface, and put the logic in “Library” projects that will be compiled as Dll files that can be used in a .Net application by adding references to them.
If you want to allow non .Net apps to used you can use COM Interop:
Wikipedia – COM Interop
COM Interop C# Tutorials
You can also use WCF services as CSharpVJ says.