Hey,

You could do this in a couple ways.

1) A quick and dirty way - refresh tag in head element:

http://en.wikipedia.org/wiki/Meta_refresh

2) A more correct way, send Redirect Response to the page:
Code:
<script runat="server">
private void Page_Load(object sender, System.EventArgs e)
{
Response.Status = "301 Moved Permanently";
Response.AddHeader("Location","<your new url>");
}
</script>
Hope that helps!!

Gary