$().ready(function () {
    $("[id$='_comune']").autocomplete({
        source: "/WebServices/Localization.ashx",
        minLength: 2,
        select: function (event, ui) {
            if (ui.item) {
                $("[id$='_codiceComune']").val(ui.item.id);
            }
            else
                $("[id$='_codiceComune']").val('');
        }
    });
});