partial void UpdateCity(City instance);
 partial void DeleteCity(City instance);
 partial void InsertCity(City instance);
		private void detach_City(City entity)
		{
			this.SendPropertyChanging();
			entity.Province = null;
		}
		private void attach_City(City entity)
		{
			this.SendPropertyChanging();
			entity.Province = this;
		}
		private void detach_City(City entity)
		{
			this.SendPropertyChanging();
			entity.SmallArea = null;
		}
		private void attach_City(City entity)
		{
			this.SendPropertyChanging();
			entity.SmallArea = this;
		}