private void SaveButton_Click(object sender, RoutedEventArgs e)
 {
     try
     {
         _bookReservationJournal.BookingStartDate = (DateTime)StartDatePicker.SelectedDate;
         _bookReservationJournal.BookingEndDate   = (DateTime)EndDatePicker.SelectedDate;
         _bookReservationJournal.BookingStatusId  = 1;
         _bookReservationJournal.ReaderId         = _readerId;
         _bookReservationJournal.BookId           = _bookId;
         _bookReservationJournal.ReservationCode  = GenerateReservationCode();
         dBQueryHelper.AddJournalRecord(_bookReservationJournal);
         this.Close();
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.ToString());
     }
 }