private void detach_Appointments(Appointment entity)
 {
     this.SendPropertyChanging();
     entity.User = null;
 }
 private void attach_Appointments(Appointment entity)
 {
     this.SendPropertyChanging();
     entity.User = this;
 }
 partial void DeleteAppointment(Appointment instance);
 partial void UpdateAppointment(Appointment instance);
 partial void InsertAppointment(Appointment instance);
 private void detach_Appointments(Appointment entity)
 {
     this.SendPropertyChanging();
     entity.DoctorsAndSpeciality = null;
 }