How to read [object Object] returned by Ajax

How to read [object Object] returned by Ajax

I have
  1. var list = [someID, name, email, "0"];
    dataToSend = JSON.stringify({ list: list });
    $.ajax({
        type: "POST",
        url: "metodos.aspx/sendEmailYCrear",
        contentType: "application/json; charset=utf-8",
        data: dataToSend,
        dataType: "json",
        success: AjaxOkAndAdd,
        error: AjaxFailedEmail
    });









Which sends the data to the URL ok. I process everything on the C# code behind with no problem.
But the returned value (I create a string to return some values) is recognized as an [object Object] and I cant read the result! (actually I don't know how)

Any suggestion?
Thanks!