private static string GetWebText(string url)
        {
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
            request.UserAgent = "A .NET Web Crawler";
            WebResponse response = request.GetResponse();
            Stream stream = response.GetResponseStream();
            StreamReader reader = new StreamReader(stream);
            string htmlText = reader.ReadToEnd();
            return htmlText;
        }