从客户端调用服务器方法在ASP.NET中使用jQuery AJAX

Question

我必须使用ajax调用来调用服务器端方法更新（输入参数）。当我运行代码时，我的ajax没有加载。我想将该数据更新到Jquery Data table.please给我建议

$（文件）.on（＆＃39;点击＆＃39;，＆＃39;＃btnsave＆＃39;，function（）{

                        //have to get the emp_id
                        var id = $('#hdnid').val();
                        update(id);

                    });

功能更新（id）{

            var name = $('#txtempname').val();

            var sal = $('#txtsal').val();

            var Dept_Id = $('#ddllist').val();

            $.ajax({
                //var Data = "{ empname:" + name + "}";

                url: 'jdatatable.aspx/update',//my  .aspx page name 

                type: "POST",

                data: '{ id: ' + id + ',empname: "' + name + '", sal: ' +sal + ', Dept_Id: ' + Dept_Id + ' }',
                contentType: "application/json; charset=utf-8",

                dataType: "json",

                "success": function (data) {

                    alert("successfully done");

                    table.ajax.reload();

                    $('#txtempname').val('');

                    $('#txtsal').val('');

                    $('#ddllist').val('');

                },
                "error": function (data, xhr, status) {
                    alert(status);
                }
            });

jdatatable.aspx.cs

protected void Page_Load（object sender，EventArgs e）         {

        if (!Page.IsPostBack)
        {




        }


    }

//的MyMethod  [System.Web.Services.WebMethod]

[ScriptMethod（UseHttpGet = false，ResponseFormat = ResponseFormat.Json，XmlSerializeString = false）]

    public void update(int id, string empname, int sal, int Dept_Id)
    {

        string s =    ConfigurationManager.ConnectionStrings["dbconn"].ToString();
        List<UserDetails> li = new List<UserDetails>();
        SqlConnection con = new SqlConnection(s);
        con.Open();
        SqlCommand cmd = new SqlCommand("sp_update", con);
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Parameters.Add(new SqlParameter("@id", id));
        cmd.Parameters.Add(new SqlParameter("@Emp_Name", empname));
        cmd.Parameters.Add(new SqlParameter("@Sal", sal));
        cmd.Parameters.Add(new SqlParameter("@Dept_Id", Dept_Id));
        cmd.ExecuteNonQuery();
        con.Close();
    }