c#里 treevie 跳转面怎么传参

跳转的时候不执行啊
 protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e)
    {
        if (TreeView1.SelectedNode.Depth == 0)
        {
            Session["p1"] = TreeView1.SelectedNode.Text;
        }
        if (TreeView1.SelectedNode.Depth == 1)
        {
            Session["p1"] = TreeView1.SelectedNode.Parent.Text;
        }
        if (TreeView1.SelectedNode.Depth == 2)
        {
            Session["p1"] = TreeView1.SelectedNode.Parent.Parent.Text;
            Session["p2"] = TreeView1.SelectedNode.Text;
        }
       
    } 
--------------------编程问答-------------------- 会不会加了updatePanel?

补充：.NET技术 ,  ASP.NET