partial void DeleteListing(Listing instance);
 partial void UpdateListing(Listing instance);
		private void detach_Listings(Listing entity)
		{
			this.SendPropertyChanging();
			entity.Building = null;
		}
 partial void InsertListing(Listing instance);
		private void attach_Listings(Listing entity)
		{
			this.SendPropertyChanging();
			entity.Building = this;
		}