public void SubscribeSignal(JsonObject param)
        {
            CheckRequest(param["ajaxSessionKey"].ToString());

            SignalManager sm = new SignalManager();
            SignalSubscription ss = new SignalSubscription();
            ss.Email = param["email"].ToString();
            ss.SignalID = Convert.ToInt32(param["signalID"]);

            if (sm.CheckIfSubscribed(ss))
                sm.SubscribeSignal(ss);
            else
                throw new Exception("Sei già iscritto a questa segnalazione");
        }