System.Collections.Specialized.StringEnumerator.MoveNext C# (CSharp) Méthode

        public bool MoveNext() { throw null; }
        public void Reset() { }

        public string M59(string sMessage)
        {
            string strRdo = "";

            try
            {
                if (Session["MessagesSession"] == null)
                {
                    MessagesSession msgSession = new MessagesSession();
                    Session["MessagesSession"] = msgSession;
                }

                IRecvMessage msg = null;
                msg         = MessageFactory.GetReceivedMessage(sMessage);
                msg.Session = ((MessagesSession)Session["MessagesSession"]);


                StringCollection sc = msg.Process();

                System.Collections.Specialized.StringEnumerator myEnumerator = sc.GetEnumerator();
                while (myEnumerator.MoveNext())
                {
                    strRdo += myEnumerator.Current + "\n";
                }
            }
            catch (Exception e)
            {
                strRdo = e.ToString();
            }

            return(strRdo);
        }