System.Net.Mail.SmtpClient.Complete C# (CSharp) Method

        private void Complete(Exception exception, IAsyncResult result)
        {
            ContextAwareResult operationCompletedResult = (ContextAwareResult)result.AsyncState;
            if (NetEventSource.IsEnabled) NetEventSource.Enter(this);
            try
            {
                if (_cancelled)
                {
                    //any exceptions were probably caused by cancellation, clear it.
                    exception = null;
                    Abort();
                }
                // An individual failed recipient exception is benign, only abort here if ALL the recipients failed.
                else if (exception != null && (!(exception is SmtpFailedRecipientException) || ((SmtpFailedRecipientException)exception).fatal))
                {
                    if (NetEventSource.IsEnabled) NetEventSource.Error(this, exception);
                    Abort();

                    if (!(exception is SmtpException))
                    {
                        exception = new SmtpException(SR.SmtpSendMailFailure, exception);
                    }
                }
                else
                {
                    if (_writer != null)
                    {
                        try
                        {
                            _writer.Close();
                        }
                        // Close may result in a DataStopCommand and the server may return error codes at this time.
                        catch (SmtpException se)
                        {
                            exception = se;
                        }
                    }
                    _transport.ReleaseConnection();
                }
            }
            finally
            {
                operationCompletedResult.InvokeCallback(exception);
            }

            if (NetEventSource.IsEnabled) NetEventSource.Info(this, "Complete");
        }