I just added a new C# .Net dll to my solution and am accesing it from my C++ unmaged application by creating using COM to link with C#. The question is how do I send a callback function to C# in order to call back some function from unmanaged C++? The use of delegates seem to work if I'm accessing C++ dll. Bot here I want to access the C++ application instead. Any help/leads would be really appreciated.