public DataTable LoadProductReturnSummaryTableForAllDataByInvoiceDateCustomerGroupId(Int32 CustomerGroup_Id, DateTime dateTime_From, DateTime dateTime_To, Int32 Category_Id) { DALInvoice obj_DALInvoice = new DALInvoice(); DataTable dt_Invoice = obj_DALInvoice.LoadProductReturnSummaryTableForAllDataByInvoiceDateCustomerGroupId(CustomerGroup_Id, dateTime_From, dateTime_To, Category_Id); obj_DALInvoice = null; return(dt_Invoice); }