WhatsAppApi.WhatsApp.RequestLastSeen C# (CSharp) Метод

        public void RequestLastSeen(string jid)
        {
            this.WhatsParser.WhatsSendHandler.SendQueryLastOnline(jid);
        }

        private static void ProcessChat(WhatsApp wa, string dst)
        {
            var thRecv = new Thread(t =>
                                        {
                                            try
                                            {
                                                while (wa != null)
                                                {
                                                    if (!wa.HasMessages())
                                                    {
                                                        wa.PollMessages();
                                                        Thread.Sleep(100);
                                                        continue;
                                                    }
                                                    var buff = wa.GetAllMessages();
                                                }
                                            }
                                            catch (ThreadAbortException)
                                            {
                                            }
                                        }) {IsBackground = true};
            thRecv.Start();
            WhatsUserManager usrMan = new WhatsUserManager();
            var tmpUser = usrMan.CreateUser(dst, "User");

            while (true)
            {
                string line = Console.ReadLine();
                if (line == null && line.Length == 0)
                    continue;

                string command = line.Trim();
                switch (command)
                {
                    case "/query":
                        //var dst = dst//trim(strstr($line, ' ', FALSE));
                        PrintToConsole("[] Interactive conversation with {0}:", tmpUser);
                        break;
                    case "/accountinfo":
                        PrintToConsole("[] Account Info: {0}", wa.GetAccountInfo().ToString());
                        break;
                    case "/lastseen":
                        PrintToConsole("[] Request last seen {0}", tmpUser);
                        wa.RequestLastSeen(tmpUser.GetFullJid());
                        break;
                    case "/exit":
                        wa = null;
                        thRecv.Abort();
                        return;
                    case "/start":
                        wa.WhatsSendHandler.SendComposing(tmpUser.GetFullJid());
                        break;
                    case "/pause":
                        wa.WhatsSendHandler.SendPaused(tmpUser.GetFullJid());
                        break;
                    case "/register":
                        {
                            RegisterAccount();
                            break;
                        }
                    default:
                        PrintToConsole("[] Send message to {0}: {1}", tmpUser, line);
                        wa.Message(tmpUser.GetFullJid(), line);
                        break;
                }
               }
        }