$(document).ready(function () {

    $("#categorySelect").change(function () {
        $("#searchForm").submit();
    });

    $("#searchForm").submit(function (event) {
        $("#searchForm").validate().element("input#City");
    });

    $("input#City").autocomplete({
        source: function (request, response) {
            $.ajax({
                url: '/Services/GetCities', type: "POST", dataType: "json",
                // query will be the param used by your action method
                data: { query: request.term },
                success: function (data) {
                    response($.map(data, function (item) {
                        return { label: item, value: item };
                    }))
                }
            })
        },
        minLength: 1 // require at least one character from the user
    });
});