解析html下的xml文件

           string Path = ”    ";

           //   Creates   an   HttpWebRequest   with   the   specified   URL.  
            HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(Path);
            //   Sends   the   HttpWebRequest   and   waits   for   the   response.                        
            HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
            //   Gets   the   stream   associated   with   the   response.
            Stream receiveStream = myHttpWebResponse.GetResponseStream();
            Encoding encode = System.Text.Encoding.GetEncoding("utf-8");
            //   Pipes   the   stream   to   a   higher   level   stream   reader   with   the   required   encoding   format.  
            StreamReader sr = new StreamReader(receiveStream, encode);

            string rl;
            StringBuilder sb = new StringBuilder();
            while ((rl = sr.ReadLine()) != null)
            {

                sb.Append(rl);

            }
            string stra = sb.ToString();

            try
            {
                //Get XML
                int IndexofA = stra.IndexOf("<?xml version=\"1.0\" encoding=\"utf-16\"?>");
                int IndexofB = stra.IndexOf("</span>");
                string Ru = stra.Substring(IndexofA, IndexofB - IndexofA);
                //Replace localhost
                lblMess.Text = Ru.ToString();
            }
            catch
            {
                lblMess.Text = "无法查询!";
            }