Using extension method we can create methods to convert an enum to other datatype like string, int by creating extension methods ToInt(), ToString()
You can either make extension methods on int and string.
Or make static method on some other static class. Maybe something like EnumHelper.FromInt(int).
But I would pose one question : Why do you want to convert to string or int? Its not how you normaly work with enumerables, except maybe serialisation. But that should be handled by some kind of infrastructure, not your own code.