xml转换为dataset

        /// <summary>
        /// 读取数据集并加入缓存
        /// sea 2009-12-11
        /// </summary>
        /// <returns>结果集</returns>
        private DataSet BindData()
        {
            if (Cache["ds"] == null)
            {
                XmlDocument xdoc = new XmlDocument();
                xdoc.LoadXml(Service.TicketCancel.GetTicketCancel());
                DataSet ds = CreatDataSet();
                XmlNodeList xlist = xdoc.SelectSingleNode("/JIT-Cancel-Response").ChildNodes;
                foreach (XmlNode xnode in xlist)
                {
                    DataRow dr = ds.Tables[0].NewRow();
                    dr["id"] = xnode.Attributes["id"].Value;
                    dr["AirlineCompanyC"] = xnode.Attributes["AirlineCompanyC"].Value;