Hi, I'am trying to serialize CultureInfo object (here becomes the code)

private void SerializeCulture(string filename) {
        CultureInfo ci = new CultureInfo("es-AR", false);
        XmlSerializer ser = new XmlSerializer(ci.GetType());

        TextWriter writer = new StreamWriter(filename);
            ser.Serialize(writer, ci);
            writer.Close();
}

And when I run the project I have this error:

"An unhandled exception of type 'System.InvalidOperationException' occurred in system.xml.dll

Additional information: There was an error reflecting 'System.Globalization.CultureInfo'."

in the line "XmlSerializer ser = new XmlSerializer(ci.GetType());"
------------------------------------------------------------------

SOMEONE CAN HELP ME ON THIS?
Thanks a lot.