Ajax.ActionLink问题

<%: Ajax.ActionLink( "RSVP for this event",
                             "Register", "RSVP",
                             new { id=Model.DinnerID }, 
                             new AjaxOptions { UpdateTargetId="rsvpmsg" }) %> 
                                <% } %>

<a href="/RSVP/Register/4" onclick="Sys.Mvc.AsyncHyperlink.handleClick(this, new Sys.UI.DomEvent(event), { insertionMode: Sys.Mvc.InsertionMode.replace, updateTargetId: &#39;rsvpmsg&#39; });">RSVP for this event</a>