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Prevent Duplicate Values from Being Added to a List Control

Public Sub AddUnique(lst As Object, str As String)

'Purpose: Add String to a list control
'only if that string is not already there

'Parameters: lst: ListBox, ComboBox, or
'any control with a similar interface

'str: string value to add if
'that string is not already there

Dim nIndex As Integer
Dim bFound As Boolean
Dim vTest As Variant

On Error Resume Next

'this test allows you
'to use the function for
'any control that supports
'listbox like functionality

vTest = lst.ListCount
If vTest > 0 Then vTest = lst.List(0)
vTest = lst.ListIndex
lst.AddItem vTest
lst.Clear

If Err.Number > 0 Then Exit Sub
On Error GoTo 0

' Add a string to a list box only if it does not
' already exist

With lst
For nIndex = 0 To .ListCount - 1
If .List(nIndex) = str Then
bFound = True
Exit For
End If
Next
If Not bFound Then
.AddItem str
End If
End With

End Sub		 Prevent Duplicate Values from Being Added to a Lis

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