protected void OnRowDeleting(object sender, GridViewDeleteEventArgs e)
{
int index = e.RowIndex;
string departure = GridView.Rows[index].Cells[1].Text;
string arrival = GridView.Rows[index].Cells[2].Text;
FlightsService service = Service.getInstanse().flightService;
service.DeleteFlightPrice(departure, arrival);
UpdateAllTable();
}