// observer pattern
// update status by observer
public void ReceiveAndNotify(object obj)
{
StockBLL sbp = obj as StockBLL;
if (sbp != null)
{
disableOrderStatus(sbp.StockID);
}
}
// invoke event
private void fireObserverEvent(int stockID)
{
StockBLL stockBll = new StockBLL(stockID);
InventoryForm invform = new InventoryForm();
OrderBLL orderBLL = new OrderBLL();
stockBll.AddObserver(new NotifyEventDelegate(invform.ReceiveAndNotify));
stockBll.AddObserver(new NotifyEventDelegate(orderBLL.ReceiveAndNotify));
stockBll.Update();
}