读取XML绑定TreeNode

<asp:TreeView ID="treeview" OnClick="TreeViewCheckBox_Click()"  runat="server">
</asp:TreeView>

treeview.ShowCheckBoxes = TreeNodeTypes.All;
treeview.ShowLines = true;
treeview.ExpandDepth = 1;
treeview.TreeNodeCheckChanged += new TreeNodeEventHandler(treeview_TreeNodeCheckChanged);
if (!IsPostBack)
{
string url = "../../Xml/LayerConfig11.xml";
url = Server.MapPath(url);
XmlDocument xDoc = new XmlDocument();
xDoc.Load(url);

XmlNode fn = xDoc.DocumentElement;
TreeNode tn = new TreeNode();
tn.Text = fn.Attributes["Name"].Value;
tn.ImageUrl = fn.Attributes["Icon"].Value;
tn.SelectAction = TreeNodeSelectAction.None;
treeview.Nodes.Add(tn);

for (int i = 0; i < treeview.Nodes.Count; i++)
{
if (treeview.Nodes[i].Checked)
{
treeview.Nodes[i].Parent.Checked = true;
}
}
XmlNodeList nodes = fn.ChildNodes;
foreach (XmlNode item in nodes)
{

if (item.Attributes["No"].Value == "06" || item.Attributes["No"].Value == "00")
{
TreeNode tn02 = new TreeNode();
tn02.Text = item.Attributes["Name"].Value;
tn02.ImageUrl = item.Attributes["Icon"].Value;
tn02.SelectAction = TreeNodeSelectAction.None;
tn.ChildNodes.Add(tn02);
AddNodes(tn02, item);
}
}
}

/// <summary>
/// 递归绑定节点
/// </summary>
/// <param name="tnode">父级节点</param>
/// <param name="xnode">源节点</param>
private void AddNodes(TreeNode tnode, XmlNode xnode)
{
if (xnode.HasChildNodes)
{
foreach (XmlNode child in xnode.ChildNodes)
{
TreeNode tn03 = new TreeNode();
tn03.Text = child.Attributes["Name"].Value;
tn03.ImageUrl = child.Attributes["Icon"].Value;
tn03.SelectAction = TreeNodeSelectAction.None;
tnode.ChildNodes.Add(tn03);
if (child.HasChildNodes)
{
AddNodes(tn03, child);
}
else
{
continue;
}
}
}
}