ASP.NET - Como mandar variables de JavaScript a una clase en Asp.Net C#

function CargarGrabada(id) {

    $("#loading-div-background").show();

    alert(id);

    $.getJSON(uriREST + "/Comisiones/GrabadaDetelles/?Id_Padre=" + id).done(Muestratabla)

     .fail(function (error) { console.log(error); });

    $("#gvgrabadaDetalle").show();

}

//code sw

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Script.Services;

using System.Web.Services;

using System.Web.Script.Serialization;

namespace urNamesSpaces

{

    /// <summary>

    /// Summary description for saveDetail

    /// </summary>

    [WebService(Namespace = "http://tempuri.org/")]

    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

    [System.ComponentModel.ToolboxItem(false)]

    // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 

    [System.Web.Script.Services.ScriptService]

    public class saveDetail : System.Web.Services.WebService

    {

        SanofiCommunityDataContext dba = new SanofiCommunityDataContext();

        [WebMethod]

        [ScriptMethod(ResponseFormat = System.Web.Script.Services.ResponseFormat.Json)]

        public string SendQualifed(int id)

        {

            //ur Functions here

            //Responce ur ws in Json Format

            var json = new JavaScriptSerializer().Serialize(responceMessage);

            return json;

        }

    }

}

//inHTml

 function saveQualif(val) {

        try {

            $.ajax({

                type: "POST",

                url: "../../../services/saveDetail.asmx/SendQualifed  ",

                data: "{'id':'"+id+"'}",

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

                success: SuccessTestService,

                dataType: "json",

                failure: ajaxCallFailed

            });

        }

        catch (e) {

            alert('failed to call web service. Error: ' + e);

        }

    }

    function SuccessTestService(responce) {

        alert(eval(responce.d));

        LestBack();

    }

    function ajaxCallFailed(error) {

        alert('error: ' + error);

    }

}