Creating an ascx control file - can't get data to display

Hi,
I wrote (with the help of the MSDN forums:) ) an XSLT file to transform an RSS 2.0 feed to HTML and it works great. However, my host told me that in order for it to be used within the eCommerce system that they provide I have to turn it into an ASCX control file. I've never done this before and am still pretty new to ASP.NET (though been programming C# and VB.NET for 4+ years).
I can't seem to get the data to display on the page once I convert the file over to an ascx file.
<%@ Control Language="c#" AutoEventWireup="false" %>
<%@ Import Namespace="AmeriCommerce.Common" %>
<%@ Import Namespace="System.Data" %>
<%@ Assembly Name="System.Xml" %>
<%@ Import Namespace="System.Xml.Xsl" %>

<script runat="server" language="c#">
        private void Page_Load(object sender, Sy ...