Hi, I have a question concerning MFC drawing on a WinForm. I have old drawing in MFC (using CDC) and I want to use that code to draw on a C# WinForm. Here is the old MFC code: --------------------------------------------------------------- void CMyDrawer :: Draw(CDC& dc) { dc.Rectangle(10, 10, 50, 60); } --------------------------------------------------------------- And here is the code in the wrapper DLL (mixed DLL) that I used to wrap the native code and make it usable in a C# assembly: --------------------------------------------------------------- void CMyDrawerWrapper :: Draw(IntPtr handlePtr) { HDC hDC = static_cast(handlePtr.ToPointer()); CDC dc; dc.Attach(hDC); CMyDrawer myDrawer myDrawer.Draw(dc); } --------------------------------------------------------------- And finally this is the code I have in the C# WinForm: --------------------------------------------------------------- private void Form1_Load(object sender, EventArgs e) { if (pictureBox1.Image == null) { pictureBox1.Image = new Bitmap(pictureBox1.Width, pictureBox1.Height); } MyDrawerWrapperNamespace.CMyDrawerWrapper myDrawerWrapper = new MyDrawerWrapperNamespace.CMyDrawerWrapper(); myDrawerWrapper.Draw(pictureBox1.Handle); } --------------------------------------------------------------- Unfortunately the code is not drawing anything.. Is there anything I am missing? Please advise. Thanks in advance