protected void TreeView1_SelectedNodeChanged(object sender, 
EventArgs e)
{
Label1.Text = "You Selected " + TreeView1.SelectedNode.Text
                                 + " category";
}
protected void Page_Load(object sender, EventArgs e)
{
   switch (Request.QueryString["id"])
   {
      case "1":
         Label1.Text="You selected ASP.NET category";
         break;
      case "2":
         Label1.Text="You selected Web Services category";
         break;
      case "3":
         Label1.Text="You selected JSP category";
         break;
      case "4":
         Label1.Text="You selected Windows Forms category";
         break;
      case "5":
         Label1.Text="You selected ActiveX category";
         break;
      case "6":
         Label1.Text="You selected Smart Client category";
         break;
      case "7":
         Label1.Text="You selected COM category";
         break;
      case "8":
         Label1.Text="You selected DCOM category";
         break;
      case "9":
         Label1.Text = "You selected Remoting category";
         break;
   }
}