尝试绑定gridview但绑定数据和行后都消失了

Question

我正在尝试使用Ajax jquery绑定gridview。虽然我看到数据与gridview绑定并在浏览器中显示但是在完成调试之后。填充行的所有数据都会消失。请找出问题但是在执行$（“＃THistory”）之后。单击（function（）{此函数调试器转到Page_Load方法 Ajax部分

 <%--GridView Populate--%> 
    <script type="text/javascript">
        $(function () {
        $("#THistory").click(function () {           
                $.ajax({
                    type: "POST",
                    url: "TDC.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*=gvCustomers] tr:last-child").clone(true);
                $("[id*=gvCustomers] tr").not($("[id*=gvCustomers] tr:first-child")).remove();
                $.each(customers, function () {
                    var customer = $(this);
                    $("td", row).eq(0).html($(this).find("REVISION").text());
                    $("td", row).eq(1).html($(this).find("P_GROUP").text());
                    $("[id*=gvCustomers]").append(row);
                    row = $("[id*=gvCustomers] tr:last-child").clone(true);
                });
            }
        });
        </script>
     <%--GridView Populate--%> 

的.cs

    protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                    this.BindDummyRow();
            }
        }
 private void BindDummyRow()
    {
        DataTable dummy = new DataTable();
        dummy.Columns.Add("REVISION");
        dummy.Columns.Add("P_GROUP");
        dummy.Rows.Add();
        gvCustomers.DataSource = dummy;
        gvCustomers.DataBind();
        //gvCustomers.Visible = false;
    }
    [WebMethod]
    public static string GetCustomers()
    {
        string query = "SELECT REVISION, P_GROUP from tdc_product1 ";
        OracleCommand cmd = new OracleCommand(query);
        return GetData(cmd).GetXml();
    }
    private static DataSet GetData(OracleCommand cmd)
    {
        string strConnString = ConfigurationManager.ConnectionStrings["conndbprodnew"].ConnectionString;
        using (OracleConnection con = new OracleConnection(strConnString))
        {
            using (OracleDataAdapter sda = new OracleDataAdapter())
            {
                cmd.Connection = con;
                sda.SelectCommand = cmd;
                using (DataSet ds = new DataSet())
                {
                    sda.Fill(ds);
                    return ds;

                }
            }
        }
    }