WebMethod Internal Method

function submit() {
    var idsInOrder = $("#sortable").sortable("toArray");
    console.log(idsInOrder);
    var string_arr = idsInOrder.toString();
    console.log("STRN-" + string_arr);
    var url = "pgArrange.aspx/SaveListOrder";
    $.ajax({
        type: "POST",
        url: url,
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        data: "{'catalogname':'" + string_arr + "'}",
        success: function (data) {
        }
    });
}

[WebMethod]
    public static string SaveListOrder(string ids)
    {
        string id = "";
        foreach(string s in ids.Split(','))
        {
            if (s != "")
            {
                id = id + s + ",";
            }
            //int id = ids[i];
            //int ordinal = i;
            //...
        }
        return id;
    }