"is there is a way that I could Mix C# with C++ using DLL's"

I think I already answered via private message as why C++ it's used since you'll interact directly with the original code base without going too deep into machine code (assembler).

Also, you cannot mix (C#) with unmanaged code (C++). That's it.

buddy thanks for your help before much appreciated am using ducksoup as a practice for handling packets as I mentioned before am a software eng with c# but I have question I was hoping for a tip so since am learning C++ in order to use dev_kit to create customize Gui and more of the fancy stuff is there is a way that I could Mix C# with C++ using DLL's or maybe Creating two Applications communicating with each other through packets server/client but that's gonna take too much prefumonace from the pc