private void detach_personas(personas entity)
 {
     this.SendPropertyChanging();
     entity.usuario = null;
 }
 private void attach_personas(personas entity)
 {
     this.SendPropertyChanging();
     entity.usuario = this;
 }
 partial void Updatepersonas(personas instance);
 partial void Deletepersonas(personas instance);
 partial void Insertpersonas(personas instance);