private void UpdateAllTable() { FlightsService service = Service.getInstanse().flightService; DataTable FlightPriceTable; if (service.GetFlightsPrice(out FlightPriceTable)) { GridView.DataSource = FlightPriceTable; GridView.DataBind(); } DataTable FlightCitiesTable; if (service.GetFlightsCities(out FlightCitiesTable)) { DropDownListDeparture.Items.Clear(); DropDownListArrival.Items.Clear(); foreach (DataRow row in FlightCitiesTable.Rows) { DropDownListDeparture.Items.Add((string)row[0]); DropDownListArrival.Items.Add((string)row[0]); } } }