private void accept_Click(object sender, EventArgs e)
{
if (airportA.Text.Length == 0 || airportB.Text.Length == 0 || dateTimePicker.Text.Length == 0 || time.Text.Length == 0)
{
connections.Text = service.GetEveryConnection();
}
else if (airportA.Text.Length > 0 && airportB.Text.Length > 0 && dateTimePicker.Text.Length > 0 && time.Text.Length > 0 && time.Text.Contains(":"))
{
connections.Text = service.GetConnectionBetween(airportA.Text.ToLower(), airportB.Text.ToLower(), CreateDateFromStringAndTime(dateTimePicker.Value.ToShortDateString(), time.Text));
}
else
{
throw new WrongUserInput();
}
}