How to insert data to xml file using json coding.

hi
I have post the code for insert data to xml file using json coding

Client Side

 <script type="text/javascript">

       function GoToInsertXML() {

           var XMLfile1 = "TestXml";
           var Id = "5";
           var Name = "Jayakumar";

            $.ajax({
                type: "POST",
                url: "Default2.aspx/AddToXMLfile",
                dataType: "json",
                contentType: "application/json; charset=utf-8",
                data: "{'XMLfile' : '" + XMLfile1 + "', 'Id' : '" + Id + "', 'Name' : '" + Name + "'}",
                error: function (XMLHttpRequest, textStatus, errorThrown) {
                    alert(errorThrown);
                },
                success: function (result) {
                    //console.log(result.d);
                }
            });
        }
        
</script>

server Side

 [WebMethod]
    public static string AddToXMLfile(string XMLfile, string Id, string Name)
    {
        XDocument XMLDoc = XDocument.Load(XMLfile);
        XElement root = XMLDoc.Root;
        root.Add(new XElement("Customer",
        new XElement("Id", Id),
        new XElement("Name", Name)));
        XMLDoc.Save(XMLfile);
        return Id;
    }