>How does it run? Some type of EXE has to host it.
>
>>We're testing it using UnitTest project and also using a Windows form application. But the actual application is a class library.

The main application is written in C++. It is supposed to call various methods from that library using the XML invoke string.

Right now we're simulating this call using the Windows Forms application and calling this new library and VFP original library. This is how we can compare output of new C# code vs. original VFP dll code.