对取出的数据排序

DataSet ds3 = DataProvider.Instance().ExecProcedure("R_Parities_Config_CurrencyExchangeRateExportAll", pList3);

var resultA = from r in ds3.Tables[0].AsEnumerable()
                      orderby DateTime.Parse(r["EffectiveDate"].ToString()) descending
                      select r;
DataTable TableA = resultA.CopyToDataTable();