treeview with expand, collapse and change action (VB.net)

<%@ Page Language=VB Debug=true %>
<%@ Import Namespace="Microsoft.Web.UI.WebControls" %>
<%@ Register TagPrefix="IEControls" 
    Namespace="Microsoft.Web.UI.WebControls" 
    Assembly ="Microsoft.Web.UI.WebControls"
%>
<script runat=server>
Sub TreeChange(ByVal Sender as Object, _
    ByVal E as TreeViewSelectEventArgs)
    lblMessage.Text = "You selected node " & E.NewNode.ToString() _
        & " and moved from node " & E.OldNode.ToString() & "."
End Sub
Sub TreeExpand(ByVal Sender as Object, _
    ByVal E as TreeViewClickEventArgs)
    lblMessage2.Text = "You expanded node " _
        & E.Node.ToString() & "."

End Sub
Sub TreeCollapse(ByVal Sender as Object, _
    ByVal E as TreeViewClickEventArgs)
    lblMessage2.Text = "You collapsed node " _
        & E.Node.ToString() & "."
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>TreeView 3 Control Sample Page</TITLE>
</HEAD>
<BODY>
<form runat="server">
<Font Face="Tahoma">
<asp:Label
    id="lblMessage"
    runat="server"
/>
<BR>
<asp:Label
    id="lblMessage2"
    runat="server"
/>
<BR><BR>
<IEControls:treeview
    id="MyTree3"
    onSelectedIndexChanged="TreeChange"
    onexpand="TreeExpand" 
    oncollapse="TreeCollapse" 
    AutoPostBack="True"
    BackColor="LightYellow"
    BorderStyle=9
    BorderWidth=3
    BorderColor="DarkBlue"
    runat="server">
    <IEControls:treenode Text="A">
        <IEControls:treenode Text="A1"/>
        <IEControls:treenode Text="A2"/>
        <IEControls:treenode Text="A3">
            <IEControls:treenode Text="A31"/>
            <IEControls:treenode Text="A32"/>
            <IEControls:treenode Text="A33"/>
        </IEControls:treenode>
    </IEControls:treenode>
    <IEControls:treenode Text="B">
        <IEControls:treenode Text="B1"/>
        <IEControls:treenode Text="B2"/>
        <IEControls:treenode Text="B3"/>
        <IEControls:treenode Text="B4"/>
    </IEControls:treenode>
</IEControls:treeview>
</Font>
</Form>
</BODY>
</HTML>

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treeview with expand, collapse and change action (VB.net) : Tree « Components « ASP.Net

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