what about jQuery approach??
<div id="datepicker"></div>
<script src="@Url.Content("~/Scripts/jquery-ui-1.8.17.custom.min.js")" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$("#datepicker").datepicker();
});
</script>
and do not forget to add css link:
<link href="@Url.Content("~/Content/themes/base/jquery-ui.css")" rel="stylesheet" type="text/css" />