WebService passing XML data c#dataset operation XML parsing webservice returned XML data

The data passed by WebService can only be serialized data, typically XML data.

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         /// 通过用户名和密码 返回下行数据          /// </summary>          /// <param name="UserName">用户名</param>          /// <param name="UserPwd">密码</param>          /// <returns></returns>          [WebMethod]          public XmlDataDocument GetUpMassageDate( string UserName, string UserPwd)          {              try              {                  XmlDataDocument xd = new XmlDataDocument();                  DataSet ds = DbHelperSQL.Query( "select   Mobile,UPMessge, RecordDate from dbo.NA_Activity_Data where ActivityID in( select ActivityID from dbo.NA_Activity  where UserID in (select UserID from dbo.NA_User  where UserName=‘" + UserName.Trim() + "‘ and UserPwd=‘" + UserPwd.Trim() + "‘))" );                  if (ds != null && ds.Tables.Count > 0)                  {                      xd = new XmlDataDocument(ds);                      XmlNode root1 = xd.DocumentElement;                      XmlNodeList roots = root1.SelectNodes( "ds" );                      foreach (XmlNode item in roots)                      {                          XmlNodeList list = item.SelectNodes( "RecordDate" );                          ds.EnforceConstraints = false ;  //如果需要修改xml里的数据  需要加上这句                          foreach (XmlNode node in list)                          {                              //这里是修改XML中 RecordDate的时间格式 原始格式是：  <RecordDate>2012-04-20T16:16:00+08:00</RecordDate>                              node.InnerText = Convert.ToDateTime(node.InnerText.ToString()).ToString( "yyyy-MM-dd HH:mm" );                          }                      }                      return xd;                  }                  else                  {                      return null ;                  }              }              catch (Exception ex)              {                  return null ;              }          }Reference WebService returns XML data, parses XML data, and binds to the GridView public void DateBind()         {             UpMassgeWebserive.GetDateUpMassageSoapClient um = new UpMassgeWebserive.GetDateUpMassageSoapClient();             DataSet ds = new DataSet();             XmlNode xmlNode1;             XmlDataDocument xd = new XmlDataDocument();             StringBuilder sb;             xmlNode1 = um.GetUpMassageDate( "hzh" , "chinahzh" );             if (xmlNode1== null )             {                 return ;             }             sb = new StringBuilder(xmlNode1.OuterXml);             if (sb.ToString().Equals( "" ))             {                 return ;             }             xd.LoadXml(sb.ToString());             ds.ReadXml( new XmlNodeReader(xd));               GridView1.DataSource = ds.Tables[0].DefaultView;             GridView1.DataBind();