Limiting size of screen capture, using GDI from C#


I am calling the method to capture the entire screen. The issue is that I want to only capture only a thin slice of the desktop as a screenshot, the rest of it is meaningless. Any suggestions on how I can specify the coordinates that should be capture? Thanks

public static void CaptureScreen(string fileName, ImageFormat imageFormat)
            int hdcSrc = User32.GetWindowDC(User32.GetDesktopWindow()),
            hdcDest = GDI32.CreateCompatibleDC(hdcSrc),
            hBitmap = GDI32.CreateCompatibleBitmap(hdcSrc,
            GDI32.GetDeviceCaps(hdcSrc, 8), GDI32.GetDeviceCaps(hdcSrc, 10)); GDI32.SelectObject(hdcDest, hBitmap);
            GDI32.BitBlt(hdcDest, 0, 0, GDI32.GetDeviceCaps(hdcSrc, 8),
            GDI32.GetDeviceCaps(hdcSrc, 10), hdcSrc, 0, 0, 0x00CC0020);
            SaveImageAs(hBitmap, fileName, imageFormat);
            Cleanup(hBitmap, hdcSrc, hdcDest);
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Change the 7th and the 8th parameters values of the BitBlt method. These parameters specify the coordinates of the source image to copy from:

// Capture the desktop starting from point 100,100
GDI32.BitBlt(hdcDest, 0, 0, GDI32.GetDeviceCaps(hdcSrc, 8),
            GDI32.GetDeviceCaps(hdcSrc, 10), hdcSrc, 100, 100, 0x00CC0020);

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