public OrderLineDTO(OrderLine orderLine)
 {
     OrderLineId   = orderLine.OrderLineId;
     Amount        = orderLine.Amount;
     ConsumableDTO = new ConsumableDTO(orderLine.Consumable);
 }
 public OrderLineDTO(DisplayOrderLine displayOrderLine)
 {
     Amount        = displayOrderLine.Amount;
     ConsumableDTO = new ConsumableDTO(displayOrderLine.Consumable);
 }