partial void DeleteBulletin(Bulletin instance);
 partial void UpdateBulletin(Bulletin instance);
 partial void InsertBulletin(Bulletin instance);
		private void detach_Bulletins(Bulletin entity)
		{
			this.SendPropertyChanging();
			entity.User = null;
		}
		private void detach_Bulletins(Bulletin entity)
		{
			this.SendPropertyChanging();
			entity.DeliveryMode = null;
		}
		private void detach_Bulletins(Bulletin entity)
		{
			this.SendPropertyChanging();
			entity.Association = null;
		}