private void detach_assets(asset entity)
		{
			this.SendPropertyChanging();
			entity.facility = null;
		}
		private void attach_assets(asset entity)
		{
			this.SendPropertyChanging();
			entity.facility = this;
		}
 partial void Updateasset(asset instance);
 partial void Deleteasset(asset instance);
 partial void Insertasset(asset instance);