XML node

            XmlNamespaceManager nsmgr = new XmlNamespaceManager(xmlFile.NameTable);
            nsmgr.AddNamespace("smap", "http://schemas.microsoft.com/AspNet/SiteMap-File-1.0");
            string xpath = "//smap:siteMapNode[@url=\"{0}\"]";
            string url = "~/Index";

            return GetSiteMapNodeFromElement((XmlElement)xmlFile.SelectSingleNode(String.Format(xpath, url), nsmgr));