It works now
people who face the same problem here is the solution:

http://social.msdn.microsoft.com/For...forum=netfxbcl...

Hello
I created a dll in C# with visual studio 2010 ( I use the version 2.0 of .Net framework).
I am supposed to call this dll on 2 separates C++ project. So, In order to communicate managed code to unmanaged code, I use COM object.
The first C++ project exists in the development machine (OS Windows 7) and is created with the visual studio 2005. In this case, I import the dll, and it works correctly.
The second C++ project...