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My image disappear. How can i appear it again?

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I want to add a image into the window background. I know how to do. However, the window background will become a black color after another windows covered it. How can i auto refresh the windows background?
  
hBitmap = (HBITMAP)LoadImage(m_hInst, "Main.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
hDC = GetDC(m_hWnd);
hMemDC = CreateCompatibleDC(hDC);
SelectObject(hMemDC, hBitmap);
BitBlt(hDC, 0, 0, 250, 307, hMemDC, 0, 0, SRCCOPY);
DeleteDC(hMemDC);
ReleaseDC(m_hWnd, hDC);
DeleteObject(hBitmap);
  

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