public void AddToShoppingCart(WebshopItem webshopItem)
        {
            DisplayOrderLine o = Cart.OrderLines.FirstOrDefault(ol => ol.Consumable.ConsumableId == webshopItem.Consumable.ConsumableId);

            if (o == null)
            {
                if (webshopItem.Amount > 0)
                {
                    Cart.OrderLines.Add(new DisplayOrderLine(webshopItem.Amount, webshopItem.Consumable, Cart));
                }
            }
            else
            {
                o.Amount += webshopItem.Amount;
            }
            webshopItem.ResetAmount();
        }
 public void SetCurrentWebshopItem(WebshopItem webshopItem)
 {
     ViewModel.CurrentWebshopItem = webshopItem;
 }