Removing Duplicates from List Collection

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Sounds really simple to pull duplicates out of a list ... MS handled this with a function in VS 3.5 but in earlier versions we had to come up with our own solution.
 

Dim i As Integer
Dim lastapprover As String = String.Empty
Dim iIndex As Integer
iIndex = bulletApprovers.Items.Count

For i = 0 To bulletApprovers.Items.Count - 1
While iIndex > 0
          If bulletApprovers.Items(i).Text = lastapprover Then
               lastapprover = bulletApprovers.Items(iIndex).Text
               bulletApprovers.Items.RemoveAt(iIndex)
Else
              lastapprover = bulletApprovers.Items(iIndex - 1).Text
End If      
           iIndex = iIndex - 1
End While

Next

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