private void saveSelBtn_Click(object sender, RoutedEventArgs e)
 {
     if (sTime.IsEnabled)
     {
         new ConvertDataInDoc().ConvertFlightListInDoc(SelectData.SelectX(fList, selectedCity), SelectData.SelectXY(fList, selectedCity, timeFlight));
     }
     else
     {
         new ConvertDataInDoc().ConvertFlightListInDoc(SelectData.SelectX(fList, selectedCity), new List <Flight>());
     }
 }
        private void selBtn_Click(object sender, RoutedEventArgs e)
        {
            selectedCity = (string)cityList.SelectedItem;
            if (selectedCity == null)
            {
                ErrorShow(new Exception(), "Оберіть пункт призначення", MessageBoxButton.OK, MessageBoxImage.Information);
                return;
            }
            string selectedTime = sTime.Text;

            if (selectedTime.Equals(""))
            {
                FlightListDG.ItemsSource = SelectData.SelectX(fList, selectedCity);
            }
            else if (TimeSpan.TryParse(selectedTime, out timeFlight))
            {
                FlightListDG.ItemsSource = SelectData.SelectXY(fList, selectedCity, timeFlight);
            }
        }