public void AddMessage(Message mes)
 {
     Messages.Add(mes);
     if (!Senders.Contains(mes.Sender))
     {
         Senders.Add(mes.Sender);
     }
 }
        public Sender AddClient(TcpClient client)
        {
            IPEndPoint ipep   = (IPEndPoint)client.Client.RemoteEndPoint;
            Sender     sender = new Sender();

            sender.Address = ipep.Address.ToString();
            sender.Port    = ipep.Port;
            sender.Tcp     = client;
            if (!Senders.Contains(sender))
            {
                Senders.Add(sender);
            }

            return(sender);
        }