datable转xml

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/// <summary>       /// datatable转换xml       /// </summary>       /// <param name="xmlDS"></param>       /// <returns></returns>       public static string ConvertDataTableToXML(DataTable xmlDS)       {           StringBuilder strXml = new StringBuilder();           strXml.AppendLine("<MonitorData>");           for (int i = 0; i < xmlDS.Rows.Count; i++)           {               strXml.AppendLine("<" + xmlDS.TableName + ">");               for (int j = 0; j < xmlDS.Columns.Count; j++)               {                   strXml.AppendLine("<" + xmlDS.Columns[j].ColumnName + ">" + xmlDS.Rows[i][j] + "</" + xmlDS.Columns[j].ColumnName + ">");               }               strXml.AppendLine("</" + xmlDS.TableName + ">");           }           strXml.AppendLine("</MonitorData>");             return strXml.ToString();       }