If I understand what you are asking, you can use win32 code in your C# application by externing the methods you need and importing the DLL directly. Check out this link for more information. I've never tried this in C#, but I have done it in other languages. If you were looking to do the opposite (use the C# code in the C++ app) you can do something simliar in C++ as well. I think there are links in the article I linked to.hamid said:if not, how can i use my c#.net application to new vc++.net(win32) app that there isnt any c# code to my end app