private void detach_Registereds(Registered entity)
 {
     this.SendPropertyChanging();
     entity.Student = null;
 }
 private void attach_Registereds(Registered entity)
 {
     this.SendPropertyChanging();
     entity.Student = this;
 }
 partial void UpdateRegistered(Registered instance);
 partial void DeleteRegistered(Registered instance);
 partial void InsertRegistered(Registered instance);