public void RemoveOrderLine(OrderLine orderLine)
{
orderLine = _orderLines.Find(o => o == orderLine);
if (orderLine == null)
return;
_orderTotal -= orderLine.Total;
_orderLines.Remove(orderLine);
}
public void AddOrderLine(OrderLine orderLine)
{
_orderTotal += orderLine.Total;
_orderLines.Add(orderLine);
}