AdCreatedEventHandler.aspx font size:
C# Source: AdCreatedEventHandler.aspx   banners234.xml   
<html>
<head>
<title>AdCreated Event Handler Example</title>
<link rel="stylesheet" href="/shared/netdemos.css">

<script language="C#" runat="server">
void myAdCreatedHandler ( Object src, AdCreatedEventArgs e ) {
   adProps.DataSource = e.AdProperties;
   adProps.DataBind ( );
}
</script>
</head>

<body>
<!-- #include virtual="~/shared/top.inc" -->
<div class="header"><h2>AdCreated Event Handler Example</h2></div>

<hr size=1 width=92%>

<form runat="server">
<div align="center">

   <asp:adrotator runat="server" target="_blank"
      width=234 height=60
      borderwidth=1 bordercolor="silver"
      advertisementfile="banners234.xml"
      onAdCreated="myAdCreatedHandler"/>

   <p><input type=submit value="Reload" runat="server"></p>

   <asp:repeater id="adProps" runat="server">
      <headertemplate>
         <table width="90%" cellspacing=1 cellpadding=5>
         <tr style="background-color:lightsteelblue">
            <th colspan=2>Ad Properties</th></tr>
      </headertemplate>

      <itemtemplate>
         <tr style="background-color:#efefef">
            <td><%# Eval ( "Key" ) %></td>
            <td><%# Eval ( "Value" ) %></td></tr>
      </itemtemplate>

      <footertemplate>
         </table>
      </footertemplate>

   </asp:repeater>

</div>
</form>

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

</body>
</html>