How to call C++ DLL in C#

Question

I have written a DLL in dev C++. The DLL\'s name is \"DllMain.dll\" and it contains two functions: HelloWorld and ShowMe. The header file looks lik

Answer 1

The following code in VS 2012 worked fine:

#include 
extern "C"
{
    __declspec(dllexport) void HelloWorld ()
    {
        MessageBox (0, L"Hello World from DLL!\n", L"Hi",MB_ICONINFORMATION);
    }
    __declspec(dllexport) void ShowMe()
    {
        MessageBox (0, L"How are u?", L"Hi", MB_ICONINFORMATION);
    }
}

NOTE: If I remove the extern "C" I get exception.