partial void DeleteEleveCour(EleveCour instance);
 partial void UpdateEleveCour(EleveCour instance);
 private void detach_EleveCours(EleveCour entity)
 {
     this.SendPropertyChanging();
     entity.credential = null;
 }
 partial void InsertEleveCour(EleveCour instance);
 private void attach_EleveCours(EleveCour entity)
 {
     this.SendPropertyChanging();
     entity.Cour = this;
 }