private void detach_etudiant(etudiant entity)
 {
     this.SendPropertyChanging();
     entity.Filiere = null;
 }
 private void attach_etudiant(etudiant entity)
 {
     this.SendPropertyChanging();
     entity.Filiere = this;
 }
 partial void Updateetudiant(etudiant instance);
 partial void Deleteetudiant(etudiant instance);
 partial void Insertetudiant(etudiant instance);