public override void AddLineItem(string skuId, int quantity)
{
XmlDocument shoppingCartData = this.GetShoppingCartData();
XmlNode xmlNode = shoppingCartData.SelectSingleNode("//sc/lis");
XmlNode xmlNode2 = xmlNode.SelectSingleNode("l[@s='" + skuId + "']");
if (xmlNode2 == null)
{
xmlNode2 = CookieShoppingData.CreateLineItemNode(shoppingCartData, skuId, quantity);
xmlNode.InsertBefore(xmlNode2, xmlNode.FirstChild);
}
else
{
xmlNode2.Attributes["q"].Value = (int.Parse(xmlNode2.Attributes["q"].Value) + quantity).ToString(CultureInfo.InvariantCulture);
}
this.SaveShoppingCartData(shoppingCartData);
}