$ mono localization.exe --help --version
  -h, -?, --help             show this message and exit.
  -v, --verbose              increase message verbosity.
  -n=VALUE                   must be an int
  -V, --version              output version information and exit.
NDesk.Options Localizer Demo 1.0

$ LANGUAGE=es mono localization.exe --with-gettext --help --version
  -h, -?, --help             A mostrar este mensaje y salir.
  -v, --verbose              Aumento mensaje verbosidad.
  -n=VALUE                   Debe ser un int
  -V, --version              Salida de información de versión y sale.
NDesk.Options Localizer Demo 1.0

$ mono localization.exe --with-hello --help --version
  -h, -?, --help             hello:show this message and exit.
  -v, --verbose              hello:increase message verbosity.
  -nhello:=VALUE             hello:must be an int
  -V, --version              hello:output version information and exit.
NDesk.Options Localizer Demo 1.0

$ mono localization.exe -n not-an-int
localization: Could not convert string `not-an-int' to type Int32 for option `-n'.

$ mono localization.exe --with-hello -n not-an-int
localization: hello:Could not convert string `not-an-int' to type Int32 for option `-n'.