C++ – Windows Mobile double bufferring does not work. Still flickers

I am trying to implement double buffered drawing in a windows mobile application. But I still see the flickering. I am using InvalidateRect() in my rendering code(not shown here), instead of Updating the entire window. The rectangle mentioned in this API is flickering when I update/paint. Please help

            case WM_PAINT:
            {
            hdc = BeginPaint(hWnd, &ps);
            //hdc = GetDC(hWnd);

            HDC newDC = CreateCompatibleDC(hdc);
            HBITMAP hBitmap;
            hBitmap = CreateCompatibleBitmap(hdc,width, height);
                            SelectObject(newDC,hBitmap));
            BitBlt(hdc,0,0,width, height,newDC,0,0,SRCCOPY);

            DeleteDC(newDC);
            DeleteObject(hBitmap);
            EndPaint(hWnd, &ps);
            //ReleaseDC(hWnd,hdc); //Using this causes WM_PAIN fired without any reason.
            }
             break;