partial void DeleteSmallArea(SmallArea instance);
 partial void UpdateSmallArea(SmallArea instance);
		private void detach_SmallArea(SmallArea entity)
		{
			this.SendPropertyChanging();
			entity.CityZone = null;
		}
 partial void InsertSmallArea(SmallArea instance);
		private void attach_SmallArea(SmallArea entity)
		{
			this.SendPropertyChanging();
			entity.CityZone = this;
		}