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);
 }