partial void DeleteSite(Site instance);
 partial void UpdateSite(Site instance);
		private void detach_Sites(Site entity)
		{
			this.SendPropertyChanging();
			entity.Exhibitor = null;
		}
 partial void InsertSite(Site instance);
		private void attach_Sites(Site entity)
		{
			this.SendPropertyChanging();
			entity.Exhibitor = this;
		}