处理WEB服务返回的XML数据的方法

//此方法是使用了XmlDataDocument 

 1 for (int i = 0; i < companyInfo.Tables[0].Rows.Count; i++)
{
     string result = string.Empty;
     HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://c2.keyue.net/QPAPITRAN/CopInfo/Code/" + companyInfo.Tables[0].Rows[i]["海关编码"].ToString());
     request.Timeout = 10000;
     request.AllowAutoRedirect = false;
     HttpWebResponse response = (HttpWebResponse)request.GetResponse();
     if (response.StatusCode == HttpStatusCode.OK)
     {
         StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
         result = sr.ReadToEnd();
         sr.Close();
     }


     if (result.Contains("CopName"))
     {

         XmlDataDocument xd = new XmlDataDocument();
         DataSet ds = new DataSet();
         xd.LoadXml(result);
         ds.ReadXml(new XmlNodeReader(xd));

         if (ds != null && ds.Tables[0].Rows.Count > 0)
         {
               ExecuteSql(" update " + txtDBName.Text.Trim() + " set 企业名称 = '" + ds.Tables[0].Rows[0]["CopName"].ToString() +
                          "', 企业分级标志 = '" + ds.Tables[0].Rows[0]["CopType"].ToString() +
                          "', 有效日期 = '" + ds.Tables[0].Rows[0]["AvailDate"].ToString() +
                          "'  where  海关编码='" + companyInfo.Tables[0].Rows[i]["海关编码"].ToString() + "'");
           }

      }

                    
  }