public static extern HGDIOBJ SelectObject( HDC hdc, HGDIOBJ h);
public static extern bool CancelDC( HDC hdc);
public static extern HGDIOBJ GetCurrentObject( HDC hdc, ObjectType uObjectType);
public static extern bool ReleaseDC( WindowHandle hWnd, HDC hdc);
public static extern bool DeleteDC( HDC hdc);
public static extern HDC CreateCompatibleDC( HDC hdc);
public static extern int GetDeviceCaps( HDC hdc, DeviceCapability nIndex);
public static extern HBITMAP CreateCompatibleBitmap( HDC hdc, int cx, int cy);