This member function prevents drawing within invalid areas of a window by excluding an updated region in the window from the clipping region associated with the CDC object.
int ExcludeUpdateRgn( CWnd* pWnd );
| Header File | Afxwin.h | 
| Platforms | |
| Versions | 1.0 and later | 
| Complete documentation | Visual C++ documentation | 
CDC Overview, CDC Member Functions, Graphical Drawing Classes, CDC::ExcludeClipRect