使用XmlSerializer类序列化

 /// <summary>
        /// 序列化DataTable
        /// </summary>
        /// <param name="pDt">包含数据的DataTable</param>
        /// <returns>序列化的DataTable</returns>
        public static string SerializeDataTableXml(DataTable pDt, string pdtname)
        {
            // 序列化DataTable
            pDt.TableName = pdtname;
            StringBuilder sb = new StringBuilder();
            XmlWriter writer = XmlWriter.Create(sb);
            XmlSerializer serializer = new XmlSerializer(typeof(DataTable));
            serializer.Serialize(writer, pDt);
            writer.Close();
            return sb.ToString();
        }
        /// <summary>
        /// 反序列化DataTable
        /// </summary>
        /// <param name="pXml">序列化的DataTable</param>
        /// <returns>DataTable</returns>
        public static DataTable DeserializeDataTable(string pXml)
        {

            StringReader strReader = new StringReader(pXml);
            XmlReader xmlReader = XmlReader.Create(strReader);
            XmlSerializer serializer = new XmlSerializer(typeof(DataTable));

            DataTable dt = serializer.Deserialize(xmlReader) as DataTable;
            return dt;
        }