void ProcessNext(IAsyncResult result)
        {
            PollContext context = (PollContext)result.AsyncState;

            if (!context.PollAborted)
            {
                try
                {
                    context.Processor(result, context);
                }
                catch (Exception e)
                {
                    this.pollContext = null;
                    context.Close();
                    if (!context.PollAborted)
                    {
                        this.FaultAllSubscriptions(e);
                    }
                }
            }
            else
            {
                this.pollContext = null;
                context.Close();
            }
        }