在treeview selectednode中获取父节点和子节点的值已更改

Question

我有一个带有根节点，子节点和子节点的树状视图。单击子节点后，我需要在弹出窗口中获取该节点值及其父节点值。我将提供任何帮助。预先感谢。

*Root Node 

        1.child node 1
                   *(subchild node 1)  
                   *(subchild node 2)  

        2.child node 2

                   *(subchild node 1)  
                   *(subchild node 2) 


<asp:TreeView ID="TreeView1" 
OnSelectedNodeChanged="TreeView1_SelectedNodeChanged" 
EnableClientScript="true"  PopulateNodesFromClient="true"                              
OnTreeNodePopulate="calltree" Font-Size="8pt"   runat="server" 
ShowLines="True" HoverNodeStyle-Font-Underline="True" SelectedNodeStyle- 
Font-Bold="True"  ParentNodeStyle-ForeColor="Black">
  <Nodes>
  <asp:TreeNode Text="Chart Of Cars" Selected="true" 
  SelectAction="Expand" 
  PopulateOnDemand="true"/>
  </Nodes>
 </asp:TreeView>


 public void calltree(object sender, TreeNodeEventArgs e)
   {

       switch (e.Node.Depth)
       {
           case 0:
               HeaderTitle(e.Node);
               break;
           case 1:
                LinkURL(e.Node);
                break;

           default:
               break;
       }
   }

   public void HeaderTitle(TreeNode node)
   {
       DataSet ds_ParentNode = objcon.GetDataSet("select distinct 
        ProfileID,profilename from profile
        ");

       foreach (DataRow row in ds_ParentNode.Tables[0].Rows)
       {
           TreeNode newNode = new TreeNode();
           newNode.Text = row["ProfileID"].ToString() + ' ' + 
           row["profilename"].ToString();
           newNode.Value = row["ProfileID"].ToString();

           newNode.Expanded = false;
           newNode.SelectAction = TreeNodeSelectAction.Expand;
           newNode.PopulateOnDemand = true;
           node.ChildNodes.Add(newNode);
       }

   }

     public void LinkURL(TreeNode node)
    {
       DataSet ds_ParentNode = objcon.GetDataSet("select distinct 
        ProfileID,profilename from profile
         ");

       foreach (DataRow row in ds_ParentNode.Tables[0].Rows)
       {
           TreeNode newNode = new TreeNode();
           newNode.Text = row["ProfileID"].ToString() + ' ' + 
           row["profilename"].ToString();
           newNode.Value = row["ProfileID"].ToString();
           newNode.ImageUrl = "~/images/office2003_contacts.gif";

            newNode.Expand();

            newNode.Expanded = true;
            newNode.PopulateOnDemand = false;
            node.ChildNodes.Add(newNode);
        }

    }
     <pre> protected void TreeView1_SelectedNodeChanged(object sender, 
        EventArgs e)
    {

        int index = TreeView1.Nodes.IndexOf(TreeView1.SelectedNode); 


       TreeView1.SelectedNode.Selected = true;
        if (TreeView1.SelectedNode.Value != "")
        {
            lbl_supname.Text = TreeView1.SelectedNode.Value;
            lbl_drugname.Text = "";
            mpe_First.Show();
            pnl_First.Visible = true;
            UpdatePanel1.Update();
            UpdatePanel1_1.Update();
        }
        else
        {
            mpe_First.Hide();
            //UpdatePanel1.Update();
            pnl_First.Visible = false;
            UpdatePanel1.Update();
        }

    }

在子子节点上，单击“我需要在弹出扩展器中获取节点值。但是它显示为空”。