Autocomplete jquery

<link href="http://code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css" rel="stylesheet"></link>
    <script src="~/Scripts/jquery-ui.js"></script>

    <script>
    $(function () {
        var availableTags = JSON.parse('@Html.Raw(ViewBag.ReasonKey)');
        $("#Reason").autocomplete({
            source: availableTags
        });
    });
    </script>