public void loadDataFilter()
{
Flight flight = new Flight();
flight.Depart_date = calendar_depart.SelectedDate.ToString("yyyy-MM-dd");
flight.Arrival_date = calendar_arrival.SelectedDate.ToString("yyyy-MM-dd");
flight.Depart_country = txt_depart_country.Text;
flight.Arrival_country = txt_arrival_country.Text;
tableTicket.DataSource = null;
tableTicket.DataSource = flightDAO.SearchFlight(flight, pageIndex, pageSize);
tableTicket.DataBind();
int rowCount = flightDAO.GetRowCountFilterFlight(flight);
caculatePageCount(rowCount);
LoadPageNumber();
}