JQuery Ajax method to call server side function without postback

Client Code:

<div>

        <h3>

            This is AutoSave demo!</h3>

        <div>

            <textarea id="ContentTextarea" cols="50" rows="10"><%=HttpContext.Current.Session["UserContent"]%>  "Balajiprasad"</textarea>

            <input type='text' value='<%=HttpContext.Current.Session["UserContent"]%>' ></label>

            <br />

            <button id="SaveContentButton">

                Save</button>

            <span id="autosaveUpdates"></span>

        </div>

    </div>

    <script type="text/javascript">

        function SaveDataViaAjax(autosaveMode) {

            $("#autosaveUpdates").html("Saving ... ");

            methodURL = "Default2.aspx/SaveContent";

            parameters = "{'content':'" + $("#ContentTextarea").val() + "', 'autosave':'" + autosaveMode + "'}";

            $.ajax({

                type: "POST",

                contentType: "application/json; charset=utf-8",

                url: methodURL,

                data: parameters,

                dataType: "json",

                async: true,

                success: function (data) {

                    if (autosaveMode) {

                        $("#autosaveUpdates").html("Autosave at " + Date().toLocaleString());

                    }

                    else {

                        $("#autosaveUpdates").html("Data have been saved at " + Date().toLocaleString());

                    }

                },

                error: function (result) {

                    alert("Due to unexpected errors we were unable to load data" + result);

                }

            });

        };

        $(document).ready(function () {

            $("#SaveContentButton").click(function (event) {

                SaveDataViaAjax(true)

                event.preventDefault();

            });

        });

    </script>

Server Code:

    [WebMethod]

    public static void SaveContent(string content, bool autosave)

    {

        if (autosave)

        {

            HttpContext.Current.Session["UserContent"] = content + "Ajax hit";

        }

        else

        {

            // TODO save data to a database

            HttpContext.Current.Session["UserContent"] = String.Empty;

        }

    }