struct IRCPrefix
    {
        public enum type {servername, nick}
        public type tag;

        //servername part
        public string servername
        {
            get { if (IsServername()) return servername;  else throw new System.Exception(); }
            set { if (IsServername()) value = servername; else throw new System.Exception(); }
        }

        //nick part
        public string nick
        {
            get { if (IsNick()) return nick;  else throw new System.Exception();}
            set { if (IsNick()) nick = value; else throw new System.Exception();}
        }
        public string user
        {
            get { if (IsNick()) return user;  else throw new System.Exception();}
            set { if (IsNick()) user = value; else throw new System.Exception();}
        }

        public string host
        {
            get { if (IsNick()) return host;  else throw new System.Exception();}
            set { if (IsNick()) host = value; else throw new System.Exception();}
        }

        private bool IsNick()
        {
            if (tag == type.nick) return true;
            return false;
        }
        private bool IsServername()
        {
            if (tag == type.servername) return true;
            return false;
        }