public static List<AtcClassification> getAtcBySyndicationFeed(IEnumerable<SyndicationItem> atcs)
    {
        List<AtcClassification> atcList = new List<AtcClassification>();
        foreach (SyndicationItem item in atcs)
        {
            string ractName = item.Title.Text;
            int id = item.ElementExtensions.ReadElementExtensions<int>("id", vidalNameSpace).FirstOrDefault();
            string feedid = item.Id;
            Uri altLink = null;
            SyndicationLink altSyndicationLink = item.Links.FirstOrDefault(l => (l.RelationshipType == "inline"));
            if (altSyndicationLink != null)
            {
                altLink = altSyndicationLink.Uri;
            }
            SyndicationLink productsLinkFeed = (item.Links.FirstOrDefault(l => (l.Title == "PRODUCTS")));
            Uri productsLink = null;
            if (productsLinkFeed != null)
            {
                productsLink = productsLinkFeed.Uri;
            }

            AtcClassification atc = new AtcClassification(id,feedid, ractName, altLink,productsLink);
            atcList.Add(atc);
        }
        return atcList;
    }
        private static void getClassifChildren(List<AtcClassification> pd, AtcClassification parent, TreeNode node)
        {
            IEnumerable<AtcClassification> children = pd.Where<AtcClassification>(l => ((l.parentLink != null ? l.parentLink.ToString() : null) == parent.feedid));

            foreach (AtcClassification child in children)
            {
                TreeNode childNode = new TreeNode();

                childNode.Name = child.feedid;
                childNode.Text = child.name;
                childNode.Tag = child;
                node.Nodes.Add(childNode);
                getClassifChildren(pd, child, childNode);
            }
        }