structure/enum question

I've got a program installed here which has a form which people can fill out. One of it's drop down boxes allows you to select a value from either "default", "none" or you can enter a value from 0 to 100 in it (for a percentage).

I want to expose ths field from a class I'm writing, so when a class instance is created, this value can be set & a method called to fill this entry in the form.

What is the best / most professional way of exposing something like this which can allow multiple data types? I don't really want to expose this as a string if I can help it to minimize the chance of a wrong figure being specified.

VB Code:

Public Structure xyz
    Public _default as boolean
    Public none     as Boolean 
    Public Percentage as system.web.ui.webcontrols.unit
End Structure
 
Public Enum xyz
    _default     = 0
    none         = 1
    _1percent    = 2
    _2percent    = 3
    ...
    _100percent  = 102
End Class

These are about the only ways I can think of, neither of which look any good! Can anyone recommend how I could do this please?

Thanks!

How about just specifying it as an Integer, and use 1 or 2 special values?

e.g.
-2 = None
-1 = Default
0 = 0%
1 = 1%
2 = 2%
etc.

That would be the quickest from a performance point of view anyway..., it would also make it easier to expand upon if you developed a more complicated version of your application - i.e. Integers are serializable whereas Enums are not :)

Not a bad suggestion there! Cheers Jamie, I owe you a pint for that!