public int RemoveFromCart(Honden hond)
        {
            var shoppingCartItem =
                _appDbContext.WinkelWagenItems.SingleOrDefault(
                    s => s.Honden.HondId == hond.HondId && s.WinkelWagenId == WinkelWagenId);

            var localAmount = 0;

            if (shoppingCartItem != null)
            {
                if (shoppingCartItem.Hoeveelheid > 1)
                {
                    shoppingCartItem.Hoeveelheid--;
                    localAmount = shoppingCartItem.Hoeveelheid;
                }
                else
                {
                    _appDbContext.WinkelWagenItems.Remove(shoppingCartItem);
                }
            }

            _appDbContext.SaveChanges();

            return(localAmount);
        }
        public void AddToCart(Honden hond, int amount)
        {
            var shoppingCartItem =
                _appDbContext.WinkelWagenItems.SingleOrDefault(
                    s => s.Honden.HondId == hond.HondId && s.WinkelWagenId == WinkelWagenId);

            if (shoppingCartItem == null)
            {
                shoppingCartItem = new WinkelWagenItem
                {
                    WinkelWagenId = WinkelWagenId,
                    Honden        = hond,
                    Hoeveelheid   = 1
                };

                _appDbContext.WinkelWagenItems.Add(shoppingCartItem);
            }
            else
            {
                shoppingCartItem.Hoeveelheid++;
            }
            _appDbContext.SaveChanges();
        }