Ensure No Duplicate Entries are Added to a ListBox

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Sub NoDuplicatesInList(lst As ListBox, str As String)

Dim tf As Boolean
Dim x As Integer

If lst.ListCount = 0 And str <> "" Then
lst.AddItem str
'check to make sure no duplicate entries get into list box
Else
tf = False
For x = 0 To lst.ListCount - 1
If lst.List(x) <> str Then
tf = False
Else
tf = True
Exit For
End If
Next x
If tf = False And str <> "" Then
lst.AddItem str
End If
End If
End Sub

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