partial void Deletepembelian_vaksin(pembelian_vaksin instance);
 partial void Insertpembelian_vaksin(pembelian_vaksin instance);
 partial void Updatepembelian_vaksin(pembelian_vaksin instance);
 private void detach_pembelian_vaksins(pembelian_vaksin entity)
 {
     this.SendPropertyChanging();
     entity.akun = null;
 }