Extension method on enumeration, not instance of enumeration

Question

I have an enumeration for my Things like so:

public enum Things
{
   OneThing,
   AnotherThing
}

I would like to write an extension method

Answer 1

In my opinion, this is the cleanest way. Why?

• It works for any System.Enum
• The extension method itself is cleaner.
• To call it you just add new and that's a small trade off (because it has to have an instance in order to work.
• You aren't passing null around and it literally won't compile if you try to use it with another type.

Usage:

(new Things()).ToSelectList()

Extension Method:

[Extension()]
public SelectList ToSelectList(System.Enum source)
{
    var values = from Enum e in Enum.GetValues(source.GetType)
                select new { ID = e, Name = e.ToString() };
    return new SelectList(values, "Id", "Name");    
}