asp.net - Change TreeView image set programmatically

How to set, change TreeView ImageSet (image set) programmatically
TreeViewImageSet.aspx

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

<!DOCTYPE html>

<script runat="server">
    protected void Button1_Click(object sender, System.EventArgs e)
    {
        TreeView1.ImageSet = TreeViewImageSet.Faq;
    }
    protected void Button2_Click(object sender, System.EventArgs e)
    {
        TreeView1.ImageSet = TreeViewImageSet.Msdn;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to set, change TreeView ImageSet (image set) programmatically</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Red">TreeView Example: Change ImageSet</h2>
        <asp:SiteMapDataSource ID="SiteMapDataSource1" runat="server" />
        <asp:TreeView 
             ID="TreeView1"
             runat="server"
             DataSourceID="SiteMapDataSource1"
             Width="275"
             BorderWidth="2"
             BorderColor="SandyBrown"
             Font-Italic="true"
             >
        </asp:TreeView>
        <br />
        <asp:Button 
             ID="Button1" 
             runat="server"
             ForeColor="SeaGreen"
             Text="TreeView Faq ImageSet"
             Height="45"
             OnClick="Button1_Click"
             Font-Bold="true"
             />
        <asp:Button 
             ID="Button2" 
             runat="server"
             ForeColor="SeaGreen"
             Text="TreeView Msdn ImageSet"
             Height="45"
             OnClick="Button2_Click"
             Font-Bold="true"
             />
    </div>
    </form>
</body>
</html>
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