public IHttpActionResult CancelAppointment([FromBody] CancelAppointmentDTO cancelAppointment)
        {
            AppointmentLogic appointmentLogic = new AppointmentLogic();
            var AffectedRow = appointmentLogic.CancelAppointment(cancelAppointment.ID, cancelAppointment.CurrentUserID);

            if (AffectedRow == 0)
            {
                NotFound();
            }
            return(Ok(AffectedRow));
        }