TextBox Autocomplete with JSON in ASP.Net MVC

As Textbox autocomplete is not working. This is my code for controller and script

        public JsonResult GetProduct(string WarehouseName)
        {
            var cn = new SqlConnection();
            var ds = new DataSet();
            string strCn = ConfigurationManager.ConnectionStrings["MySqlConnection"].ToString();
            cn.ConnectionString = strCn;
            var cmd = new SqlCommand
            {
                Connection = cn,
                CommandType = CommandType.Text,
                CommandText = "select WarehouseName from Warehouse Where WarehouseName like @myParameter"
            };

            cmd.Parameters.AddWithValue("@myParameter", "%" + WarehouseName + "%");         

            try
            {
                cn.Open();
                cmd.ExecuteNonQuery();
                var da = new SqlDataAdapter(cmd);
                da.Fill(ds);
            }
            catch (Exception)
            {
            }
            finally
            {
                cn.Close();
            }
            DataTable dt = ds.Tables[0];


            var txtItems = (from DataRow row in dt.Rows
                            select row["WarehouseName"].ToString()
                                into dbValues
                            select dbValues.ToLower()).ToList();
            return Json(txtItems, JsonRequestBehavior.AllowGet);
        }

@section scripts {
    <script type="text/javascript">
        var textbox;
        var selectValue;

        $(function () {
            textbox = $("#txtCountrty");
            selectValue = $('ul#selectedValue');

            textbox.on("input", function () {
                getAutoComplete(textbox.val());
            });
        });
        function getAutoComplete(countryName) {
            var uri = "StockAdjustment/GetProduct";
            $.getJSON(uri, { countryName: countryName })
                .done(function (data) {
                    selectValue.html("");
                    var count = 0;
                    $.each(data, function (key, item) {
                        //$('<option>').text(item).appendTo('#selectedValue');
                        var li = $('<li/>').addClass('ui-menu-item').attr('role', 'menuitem')
                            .html("<a href='#' onclick=\"setText('" + item + "') \">" + item + "</a>").appendTo(selectValue);

                        count++;
                    });
                });
        }
        function setText(text) {
            textbox.val(text);
            getAutoComplete(text);
        }
    </script>

Kindly help me where the mistake occurs