TreeViewDataSourceId.aspx font size:
View Sample
<html>
<head>
<title>Binding a TreeView Control to a SiteMapDataSource</title>
<link rel="stylesheet" href="/shared/netdemos.css">
</head>

<body>
<!-- #include virtual="~/shared/top.inc" -->
<div class="header"><h2>Binding a <span class="hilite">TreeView</span> Control to a <span class="hilite">SiteMapDataSource</span></h2></div>

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

<form runat="server">
   <p align="center">This example shows a <b>TreeView</b> bound to a <i>SiteMapDataSource</i> control. </p>

   <div style="margin-left:50"
   <asp:treeview id="myTreeView" runat="server"
      datasourceid="siteMap"
      imageset="XPFileExplorer"
      showlines expanddepth=1 target="_ext">

      <levelstyles>
         <asp:treenodestyle font-bold
            verticalpadding=3 />
         <asp:treenodestyle
            verticalpadding=5 />
      </levelstyles>

   </asp:treeview>
   </div>

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

</form>

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

</body>
</html>