public void UpdateProductQuantity(int productNumber, int newQuantity)
{
if (productNumber > QuantityBoxes.Count())
{
throw new ArgumentException("There are less added items in the cart. Please specify smaller product number.");
}
var browserService = new BrowserService();
browserService.WaitUntilReady();
QuantityBoxes[productNumber - 1].SetNumber(newQuantity);
UpdateCart.Click();
browserService.WaitUntilReady();
}