System.Net.Mail.SmtpConnection.ConnectAndHandshakeAsyncResult.HandshakeCallback C# (CSharp) Method

            private static void HandshakeCallback(IAsyncResult result)
            {
                if (!result.CompletedSynchronously)
                {
                    ConnectAndHandshakeAsyncResult thisPtr = (ConnectAndHandshakeAsyncResult)result.AsyncState;
                    try
                    {
                        try
                        {
                            LineInfo info = thisPtr._connection.Reader.CurrentReader.EndReadLine(result);
                            if (info.StatusCode != SmtpStatusCode.ServiceReady)
                            {
                                thisPtr.InvokeCallback(new SmtpException(info.StatusCode, info.Line, true));
                                return;
                            }
                            if (!thisPtr.SendEHello())
                            {
                                return;
                            }
                        }
                        catch (SmtpException)
                        {
                            if (!thisPtr.SendHello())
                            {
                                return;
                            }
                        }
                    }
                    catch (Exception e)
                    {
                        thisPtr.InvokeCallback(e);
                    }
                }
            }