Go4Expert - Double buffering problem

Hi, i want to periodically draw images on extended desktop and i cannot seem to do it double buffered. The screenflickers when drawing fast. Here is my code:

Code:

void SendImageToWindow(HWND WindowHandle, int horRes, int vertRes)

{

    // get window handle

    HDC hdc = GetDC(WindowHandle);



    // increase counter

    ++counter;

    counter = counter % NUMBER_OF_COLORS;



    HDC dc = CreateCompatibleDC(hdc);

    HBITMAP hBitmap = CreateCompatibleBitmap (hdc, w, h);

    SelectObject(dc, hBitmap);



    InvalidateRect(WindowHandle, NULL, FALSE);

    UpdateWindow(WindowHandle);



    // get client rect

    GetClientRect(WindowHandle, &rcMonitor2);



    



    // create brush

    HBRUSH hBrush = CreateSolidBrush(RGB(colorTable[counter].r,colorTable[counter].g,colorTable[counter].b));

   

    FillRect(dc, &rcMonitor2, hBrush);



    // delete brush

    DeleteObject(hBrush);



    BitBlt(hdc, 0, 0, w, h, dc, 0, 0, SRCCOPY);



    ReleaseDC(0, dc);

    ReleaseDC(0, hdc);

    DeleteObject(hBitmap);

    DeleteDC(dc);

    DeleteDC(hdc);

}

What am i doing wrong?

Thank you