private void Button_Click(object sender, RoutedEventArgs e)
{
ScheduleNewAppointment();
Serialize();
PatientAppointmentCRUDOperationsWindow.getInstance(_patient).RefreshTable();
}
private void BackButton_Click(object sender, RoutedEventArgs e)
{
this.Close();
PatientAppointmentCRUDOperationsWindow.getInstance(_patient).Show();
}