private void NfcHandler_CardHandlingDone(string obj)
        {
            if (acrReader != null)
            {
                try
                {
                    // This cannot be done in the middle of handling a card, hence this construct.
                    if (signalFailure)
                    {
                        nfcHandler.SignalFailure(acrReader);
                    }
                    else if (signalSuccess)
                    {
                        nfcHandler.SignalSuccess(acrReader);
                    }
                }
                catch (PCSC.Exceptions.PCSCException e)
                {
                    Console.WriteLine("Failed signaling: " + e.Message);
                }
            }

            signalSuccess = signalFailure = false;
        }