private void detach_ItemHistories(ItemHistory entity)
		{
			this.SendPropertyChanging();
			entity.Item = null;
		}
		private void attach_ItemHistories(ItemHistory entity)
		{
			this.SendPropertyChanging();
			entity.Item = this;
		}
 partial void UpdateItemHistory(ItemHistory instance);
 partial void DeleteItemHistory(ItemHistory instance);
 partial void InsertItemHistory(ItemHistory instance);