asp.net - Enable and disable expand and collapse in a TreeView

Enable disable expand collapse in TreeView
TreeViewShowExpandCollapse.aspx

<%@ Page Language="C#" %>

<!DOCTYPE html>

<script runat="server">
    protected void Button1_Click(object sender, System.EventArgs e)
    {
        TreeView1.ShowExpandCollapse = false;
    }
    protected void Button2_Click(object sender, System.EventArgs e)
    {
        TreeView1.ShowExpandCollapse = true;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to enable disable expand collapse in TreeView, ShowExpandCollapse</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Navy">TreeView Example: ShowExpandCollapse</h2>
        <asp:SiteMapDataSource ID="SiteMapDataSource1" runat="server" />
        <asp:TreeView 
             ID="TreeView1"
             runat="server"
             DataSourceID="SiteMapDataSource1"
             Width="275"
             BorderWidth="2"
             BorderColor="LawnGreen"
             Font-Italic="false"
             ForeColor="SeaGreen"
             Font-Bold="true"
             >
        </asp:TreeView>
        <br />
        <asp:Button 
             ID="Button1" 
             runat="server"
             ForeColor="DarkGreen"
             Text="Disable Expand Collapse"
             Height="45"
             OnClick="Button1_Click"
             Font-Bold="true"
             />
        <asp:Button 
             ID="Button2" 
             runat="server"
             ForeColor="DarkGreen"
             Text="Enable Expand Collapse"
             Height="45"
             OnClick="Button2_Click"
             Font-Bold="true"
             />
    </div>
    </form>
</body>
</html>
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