public void Add(PatientAppointment appointment)
{
if (appointment == null)
{
throw new ArgumentNullException("appointment");
}
if (!Validate(appointment))
{
return; //Or throw an exception, up to you
}
var patient = _patientLogic.GetById(appointment.PatientId);
if (patient == null)
{
return;
}
patient.PatientAppointments.Add(appointment);
}