Deletes the specified device context
_WinAPI_DeleteDC ( $hDC )
|$hDC||Identifies the device context to be deleted|
An application must not delete a DC whose handle was obtained by calling the _WinAPI_GetDC() function.
Instead, it must call the _WinAPI_ReleaseDC() function to free the DC.
_WinAPI_CreateCompatibleDC, _WinAPI_GetDC, _WinAPI_ReleaseDC
Search DeleteDC in MSDN Library.