TreeViewList.Nodes.Clear();
            foreach (var item in lste)
            {
                if (item.ParentID == RootID)
                {
                    if (TreeViewList.Nodes.ContainsKey(item.ID))
                    {
                        continue;
                    }
                    TreeNode tNode = new TreeNode();
                    tNode = TreeViewList.Nodes.Add(item.ID, item.Name);
                    tNode.Tag = item.ID;
                    tNode.ContextMenuStrip = Contextmenustrip;

                    lstInfo = lste.Where(p => p.ParentID == item.ID).ToList();
                    AddDataToTreeView(lstInfo, tNode, 0);
                }
            }

 private void AddDataToTreeView(List<TviewListInfo> iEnumerable, TreeNode t, int level)
        {
            foreach (TviewListInfo c in iEnumerable)
            {
                if (TreeViewList.Nodes.ContainsKey(c.ID))
                {
                    continue;
                }
                TreeNode treenode = t.Nodes.Add(c.ID, c.Name);
                treenode.ContextMenuStrip = Contextmenustrip;
                treenode.Tag = c.ID;
                TreeViewList.Update();

                lstInfo = lst.Where(p => p.ParentID == c.ID).ToList();
                AddDataToTreeView(lstInfo, treenode, level + 1);
            }
        }

这个是WPF的，非常的全面：
http://www.codeproject.com/Articles/124644/Basic-Understanding-of-Tree-View-in-WPF