AspComet.Samples.Chat.SubscriptionChecker.CheckSubscription C# (CSharp) Method

        public void CheckSubscription(SubscribingEvent ev)
        {
            if (ev.Client.ID.Contains("A"))
            {
                ev.Cancel = true;
                ev.CancellationReason = "You've been arbitrarily stopped from joining this channel";
            }
        }