#region xml文件内容转化为DataSet
        /// <summary>
        /// xml文件内容转化为DataSet
        /// </summary>
        /// <param name="XmlFilePath"></param>
        /// <returns></returns>
        public static DataSet XmlToDataSet(string XmlFilePath)
        {
            DataSet ds = new DataSet();
            ds.ReadXml(XmlFilePath);
            return ds;
        }
        #endregion

        #region DataSet保存为Xml文件
        /// <summary>
        /// DataSet保存为Xml文件
        /// </summary>
        /// <param name="ds"></param>
        /// <param name="XmlFilePath">Xml文件的物理全路径</param>
        /// <returns>返回错误提示信息，空表示没错误</returns>
        public static string DataSetToXmlFile(DataSet ds, string XmlFilePath)
        {
            string ErrorString = "";
            XmlDataDocument xd = new XmlDataDocument(ds);
            xd.Save(XmlFilePath);
            return ErrorString;
        }
        #endregion