You'd need managed wrappers for both base and derived classes for this particular scenario. Regards, Nish My blog : Nish’s thoughts on MFC, C++/CLI and .NET

Try posting this message to the article itself so that PJ will surely see it. He may not see your question here in the VC++ forum. "Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Check the following link : http://flounder.com/mvp_tips.htm[^] suhredayan There is no spoon.

hi you already posted this msg, right? i have given the reply there.

hi rahim, suppose if the two version dll's are named as crystal32_8.dll and crystal32_10.dll. then u register the both the dll's in the registry, then instantiate both the dll's classes. Then in the reporting function try to read the version of the report file and based on the version call the appropriate object. { // in the main class CCrystal_8 m_cry8 ; // object used to get the services of crystal32_8.dll CCrystal_10 m_cry10 ; // object used to get the services of crystal32_10.dll } { //in the area of reporting the file int ver ; 1. get the version info of the report file and store it in the ver 2. if(ver == 8) //use the object m_cry8 to show that file else //use the object m_cry10 to show that file } naren

Yeah Buddy, ther is very good Class named AmHttpSocket or amHttpFile in Internet Section , it hink that will help you out. or ucan use InternetReadFile Api's if you dunno want ot use MFC based CInterneSession Class. ----------------------------- "I Think It Will Help" ----------------------------- Alok Gupta visit me at http://www.thisisalok.tk

I'm assuming your CreateInstance has failed. What is the HResult returned from it. I usually create a Crystal instance using HRESULT hr = m_Application.CreateInstance(__uuidof(Application)); What exception is thrown? Have you added an exception handler to get more details of the exception? try { m_pReport = m_pApplication->NewReport(); } catch(_com_error& e) { TRACE("COM Error: %s %s %x\n", e.ErrorMessage(), (LPCTSTR)e.Description(), e.Error()); } Michael CP Blog [^]