TreeViewImageSet.aspx font size:
View Sample
<%@ Import namespace="System.ComponentModel" %>

<html>
<head>
<title>Dynamically Setting the ImageSet Property of a TreeView Control</title>
<link rel="stylesheet" href="/shared/netdemos.css">

<script language="C#" runat="server">
   void Page_Load ( Object src, EventArgs e ) {
      if ( !IsPostBack ) {
         ICollection borders = TypeDescriptor.GetConverter ( typeof ( TreeViewImageSet ) ).GetStandardValues ( );
         foreach ( TreeViewImageSet b in borders ) {
            ImageSetSelect.Items.Add ( b.ToString ( ) );
         }
      }
      myTreeView.ImageSet = ( TreeViewImageSet ) ImageSetSelect.SelectedIndex;
   }
</script>
</head>

<body>
<!-- #include virtual="~/shared/top.inc" -->
<div class="header"><h2>Dynamically Setting the <span class="hilite">ImageSet</span> Property of a <span class="hilite">TreeView Control</span></h2></div>

<!-- #include virtual="~/shared/viewsrc_top.inc" -->
<hr size=1 width=92%>

<form runat="server">
   <p align="center">Select an <b>ImageSet</b>:
      <asp:dropdownlist id="ImageSetSelect" runat="server" autopostback /></p>

   <div style="margin-left:50">
   <asp:treeview id="myTreeView" runat="server"
      datasourceid="siteMap"
      showlines
      expanddepth=2 />
   </div>

   <asp:sitemapdatasource id="siteMap" runat="server" />

</form>

<hr size=1 width=92%>
<!-- #include virtual="~/shared/viewsrc.inc" -->

</body>
</html>