This topic continues from How to use FTPS (with server validation - part A) and How to use FTPS (with server validation - part B).
Sometimes it may be desirable to ignore the CommonName (CN) of the server's certificate completely. To configure SecureFTPConnection to this the ServerValidation property to AutomaticNoNameCheck:
ftpConnection.ServerValidation  =  SecureFTPServerValidationType.AutomaticNoNameCheck
  In this case the server's certificate is still validated against those in the Windows certificate store, but its CommonName (CN) is ignored.