partial void DeleteStreet(Street instance);
 partial void UpdateStreet(Street instance);
		private void detach_Streets(Street entity)
		{
			this.SendPropertyChanging();
			entity.City = null;
		}
 partial void InsertStreet(Street instance);
		private void attach_Streets(Street entity)
		{
			this.SendPropertyChanging();
			entity.City = this;
		}