Something

public class HulloEventArgs : EventArgs
    {
        public readonly string nick;
        public readonly string ident;
        public readonly string channel;

        public HulloEventArgs(string who, string id, string chan)
        {
            nick = who;
            ident = id;
            channel = chan;
        }

        public override string ToString()
        {
            return "HulloEventArgs :: [nick]: " + nick + ", [ident]: " + ident + ", [channel]: " + channel;
        }
    }