private void detach_Cours(Cour entity)
 {
     this.SendPropertyChanging();
     entity.prof = null;
 }
 private void attach_Cours(Cour entity)
 {
     this.SendPropertyChanging();
     entity.prof = this;
 }
 partial void UpdateCour(Cour instance);
 partial void DeleteCour(Cour instance);
 partial void InsertCour(Cour instance);