YwToolsDataClassesDataContext ctx = new YwToolsDataClassesDataContext(connDB.conndb(connDB.origin));
        public YwCompensate GetCompensate(string epcode)
        {
            Table<YwCompensate> compensateObject = ctx.GetTable<YwCompensate>();
            IQueryable<YwCompensate> compensate = from c in compensateObject
                                                  where c.U_epbillcode == epcode
                                                  select c;
            return compensate.FirstOrDefault();
        }