// Attempt to assign the selected seat to the customer
private void btnBookSeat(object sender, EventArgs e)
{
lblMessages.Text = ""; // resets all messages before start
string customer = txtName.Text;
bool hasErrors = false;
// cannot add customer on a full flight
if (AirplaneService.IsFull())
{
// attempts to add to wait list.
btnAddToWaitlist(sender, e);
lblMessages.Text += "Flight is full.\r\n";
return;
}
// book customer...
try
{
// null or empty name
if (String.IsNullOrWhiteSpace(customer))
{
txtName.Focus();
throw new NullReferenceException("Name must not be empty or white spaced\r\n");
}
}
catch (NullReferenceException ex)
{
// no name was typed
lblMessages.Text += ex.Message;
hasErrors = true;
}
// checks seat selection
try
{
if (String.IsNullOrWhiteSpace(lstBoxRow.SelectedItem.ToString()))
{
lstBoxRow.Focus();
throw new NullReferenceException();
}
}
catch (NullReferenceException)
{
// invalid seat selection
lblMessages.Text += "Select a row" + "\r\n";
hasErrors = true;
}
try
{
if (String.IsNullOrWhiteSpace(lstBoxSeat.SelectedItem.ToString()))
{
lstBoxSeat.Focus();
throw new NullReferenceException();
}
}
catch (NullReferenceException)
{
// invalid seat selection
lblMessages.Text += "Select a seat" + "\r\n";
hasErrors = true;
}
// if there are errors, stop here!
if (hasErrors)
{
return;
}
string seat = lstBoxRow.SelectedItem.ToString();
seat += lstBoxSeat.SelectedItem.ToString();
if (!AirplaneService.AssignCustomerToSeat(seat, customer))
{
lblMessages.Text += "Unable to assign customer to the seat\r\n";
}
btnShowAllSeats(sender, e); // update customer list
ResetSelection(); // clear info after successfully insertion
}
