I have looked around a couple of sites and found how to remove duplicates from a listbox but not how to send the duplicate free list of names over to a second listbox, an example of code i found
Private Sub ListBox1_SelectedIndexChanged_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
Dim fd As New Dictionary(Of String, Integer)
For Each filename As String In IO.Directory.GetFiles("c:\windows")
Next
For Each entry As KeyValuePair(Of String, Integer) In fd
ListBox1.Items.Add(String.Format("{0} ({1})", entry.Key, entry.Value))
Next
End Sub