Obsolete attribute causes property to be ignored by XmlSerialization

Question

I\'m refactoring some objects that are serialized to XML but need to keep a few properties for backwards compatibility, I\'ve got a method that converts the old object into

Answer 1

1) WAG: Try adding the XmlAttributeAttribute to the property; perhaps this will override the ObsoleteAttribute
2) PITA: Implement IXmlSerializable