Generic List Order

Hello,

I have an enum as follows:

Public Enum Feature
Title
Content
Date
Search
End

And a generic list:
Dim features As Generic.List(Of Feature)

I need to do 2 things:

1. Remove duplicate elements from my generic list (I am not sure if
generic.list allows to add duplicate elements)
2. Reorder the features according to a variable:

if a = 1 Then

Reorder features as follows:
Search, Title, Content, Date

elseif a = 2

Reorder features as follows:
Title, Search, Date, Content

...

Note: features might have all elements in feature enum or not ...
however that shouldn't affect the order.
For example, if features include Search and Content and a
= 1 then the order would be:
Search, Content

How can I do this?

Thank You,
Miguel