private void Date_Changed(object sender, SelectionChangedEventArgs e)
{
if (date.SelectedDate != null && time.SelectedIndex != -1)
{
ComboBoxItem item = time.SelectedItem as ComboBoxItem;
DateTime start = DateTime.Parse(date.Text + " " + item.Content.ToString());
RoomComboBox.ItemsSource = _roomController.GetAvailableRoomList(start, start.AddMinutes(15));
DoctorComboBox.ItemsSource = _doctorControler.GetAvailableDoctorList(start, start.AddMinutes(15));
PatientComboBox.ItemsSource = _patientController.GetAvailablePatientList(start, start.AddMinutes(15));
}
ConfirmCheck();
}