Populate ASP.Net CheckBoxList ClientSide using jQuery AJAX

This way

    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
    <script type="text/javascript">
        $(function () {
            $(function () {
                $.ajax({
                    type: "POST",
                    url: "CS.aspx/GetCustomers",
                    data: '{}',
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    success: OnSuccess,
                    failure: function (response) {
                        alert(response.d);
                    },
                    error: function (response) {
                        alert(response.d);
                    }
                });
            });
        });

        function OnSuccess(response) {
            var xmlDoc = $.parseXML(response.d);
            var xml = $(xmlDoc);
            var customers = xml.find("Table");
            var row = $("[id*=CheckBoxList1] tr:last-child").clone(true);
            $("[id*=CheckBoxList1] tr").remove();
            $.each(customers, function () {
                var customer = $(this);
                $("input", row).val($(this).find("CustomerID").text());
                $("label", row).html($(this).find("ContactName").text());
                $("[id*=CheckBoxList1] tbody").append(row);
                row = $("[id*=CheckBoxList1] tr:last-child").clone(true);
            });
        }

    </script>
    <asp:CheckBoxList ID="CheckBoxList1" runat="server">
        <asp:ListItem Text="test" Value="0"></asp:ListItem>
    </asp:CheckBoxList>

    [WebMethod]
    public static string GetCustomers()
    {
        string query = "SELECT top 10 CustomerID, ContactName, City FROM Customers";
        SqlCommand cmd = new SqlCommand(query);
        return GetData(cmd).GetXml();
    }
    private static DataSet GetData(SqlCommand cmd)
    {
        string strConnString = ConfigurationManager.ConnectionStrings["conStr"].ConnectionString;
        using (SqlConnection con = new SqlConnection(strConnString))
        {
            using (SqlDataAdapter sda = new SqlDataAdapter())
            {
                cmd.Connection = con;
                sda.SelectCommand = cmd;
                using (DataSet ds = new DataSet())
                {
                    sda.Fill(ds);
                    return ds;

                }
            }
        }
    }