Download image from URL

public Image DownloadImage(string url)
{
    Image image = null;

    try
    {
        var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
        httpWebRequest.AllowWriteStreamBuffering = true;
        httpWebRequest.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; rv:2.2) Gecko/20110201";
        httpWebRequest.Referer = "http://www.google.com/";
        httpWebRequest.Timeout = 20000;

        var webResponse = httpWebRequest.GetResponse();
        var webStream = webResponse.GetResponseStream();

        if (webStream != null) image = Image.FromStream(webStream);

        webResponse.Close();
        webResponse.Close();
    }
    catch (Exception)
    {
        return null;
    }

    return image;
}