public void OrderNewWidget(Widget widget)
{
   if ((widget.PartNumber > 0) && (widget.PartAvailable))
   {
        WigdetOrderingService.OrderNewWidgetAsync(widget.PartNumber);
   }
}

public bool IsReadyForOrdering { get { return PartNumber > 0 && PartAvailable; } }

public bool IsWidgetReadyForOrdering(Widget widget)
{
    return widget.PartNumber > 0 && widget.PartAvailable;
}

public void OrderNewWidget(Widget widget)
{
   if (IsWidgetReadyForOrdering(widget)) {
        WigdetOrderingService.OrderNewWidgetAsync(widget.PartNumber);
   }
}