public void EndAppointment()
{
TimeSpan timeNow = DateTime.Now.TimeOfDay;
string startTimeString = ActiveAppointment[6].ToString();
TimeSpan startTime = TimeSpan.Parse(startTimeString.Insert(startTimeString.Length - 2, ":"));
int appointmentDuration = (int)(timeNow - startTime).TotalMinutes;
AppointmentLogic.EndAppointment(ActiveAppointment, appointmentDuration);
MessengerInstance.Send <string>("DoctorHomeView");
return;
}