DLL Library in C#

Thanks! So one can access managed components from unmanaged applications...

Then I may need to create a dll based on the "class library" C#/vs.net project type.

But then, how do I call its functions from an unmanaged app?

You will have to write your C# class library as a COM object as is shown in the links jonorossi wrote above. Then from your unmanaged application you can access your C# project as any other COM object.

The problem is I don'y have access to the source code of the unmanaged app. It's just prewired so that it accepts dll shared libraries, not COM objects. What can I do?

thanks all for helpful comments.