Not all devices support the BitBlt function. For more information, see the RC_BITBLT raster capability entry in the GetDeviceCaps function as well as the following functions: MaskBlt, PlgBlt, and StretchBlt.

static extern int GetDeviceCaps(IntPtr hdc, int nIndex);

Public Shared Function GetDeviceCaps(ByVal hDC As IntPtr, ByVal nIndex As Integer) As Integer

            int result = GetDeviceCaps(hdc, cap);

                Dim result As Integer = GetDeviceCaps(hdc, cap)

        /// GetDeviceCaps as follows: GetDeviceCaps( hdcPrimaryMonitor, HORZRES).

        /// GetDeviceCaps as follows: GetDeviceCaps( hdcPrimaryMonitor, VERTRES).

    '''  Width of the screen of the primary display monitor in pixels. This is the same values obtained by calling GetDeviceCaps as follows: GetDeviceCaps( hdcPrimaryMonitor HORZRES).

    ''' Height of the screen of the primary display monitor in pixels. This is the same values obtained by calling GetDeviceCaps as follows: GetDeviceCaps( hdcPrimaryMonitor VERTRES).