public DataTable Orders(string queryNo, string choice, string condition)
        {
            DataTable dt          = null;
            string    queryString = null;

            switch (queryNo)
            {
            case "1":
                queryString = "API_GetSaleOrders";
                break;
            }

            try
            {
                dt = new SalesOrderGateway().OrderData(queryString, choice, condition);

                if (dt != null)
                {
                    return(dt);
                }
            }
            catch
            {
                return(null);
            }
            return(null);
        }
 public SalesOrderManager()
 {
     salesOrderGateway = new SalesOrderGateway();
 }