private void detach_PHONGs(PHONG entity)
 {
     this.SendPropertyChanging();
     entity.DAYPHONG = null;
 }
 private void attach_PHONGs(PHONG entity)
 {
     this.SendPropertyChanging();
     entity.DAYPHONG = this;
 }
 partial void DeletePHONG(PHONG instance);
 partial void UpdatePHONG(PHONG instance);
 partial void InsertPHONG(PHONG instance);
 private void attach_PHONGs(PHONG entity)
 {
     this.SendPropertyChanging();
     entity.CANBO_QL = this;
 }