Access Violation Exception/Crash from C++ callback to C# function

Question

So I have a native 3rd party C++ code base I am working with (.lib and .hpp files) that I used to build a wrapper in C++/CLI for eventual use in C#.

I\'ve run into

Answer 1

I'm with @jdehaan, except CallingConvetion.StdCall could be the answer, especially when the 3rd party lib is written in BC++, for example.