there: The Application is build from C#, and the Dll is built from C++, and they are in different solution. When I Launch the Dll's debugger, there is always a message box pop up, which says "Debugging information for 'App.exe' cannot be found or does not match.Skipped loading symbols for NGen binary."
Thanks.
p.s. I've try putting the App.pdb in several location, but still don't work.