In IE6, Response.Redirect does not work properly when you specify an (#) anchor as a bookmark in a string you pass to Response.Redirect(). In one of our project, we used Response.Redirect, specify an ulr and then append the (#) anchor to bookmark where we want the link to navigate to on the targeted page. This works fine in IE 7 and Firefox, but this does not work in IE6. The work around for this is simply appending a meaningless QueryString value after your real request and before the (#) anchor or just add an "&" right before the (#)anchor.
What you expect to happen is that the link should navigate you to an anchor tag with the name "itemdetail" somewhere on the detail page for itemid=1.
<a name="itemdetail">some details…</a>
This is true in IE 7 and Firefox, but not in IE 6. In IE6 you can navigate to this anchor if you append it with an "&":