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Catpture webpage snapshot by form control
[STAThread]
static Image Capture(string url, int width, int height)
{
    WebBrowser wb = new WebBrowser();

    wb.Navigate(url);
    wb.ScrollBarsEnabled = false;
    wb.ScriptErrorsSuppressed = false;

    while (wb.ReadyState != WebBrowserReadyState.Complete)
    {
        Application.DoEvents();
    }

    // Set the size of the WebBrowser control
    wb.Width = width;
    wb.Height = height;

    if (width == -1)
    {
        // Take Screenshot of the web pages full width
        wb.Width = wb.Document.Body.ScrollRectangle.Width;
    }

    if (height == -1)
    {
        // Take Screenshot of the web pages full height
        wb.Height = wb.Document.Body.ScrollRectangle.Height;
    }

    // Get a Bitmap representation of the webpage as it's rendered in the WebBrowser control
    Bitmap bitmap = new Bitmap(wb.Width, wb.Height);
    wb.DrawToBitmap(bitmap, new Rectangle(0, 0, wb.Width, wb.Height));
    wb.Dispose();

    return bitmap;
}