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Excel VB Error Message

Last Modified: 2013-12-25
When I run the following script, and someone puts the wrong number in the script, such as 123456789, it empties the cell but doesn't give them an error message. How can I rewrite the code to not only empty the cell, but give them an error message as well?

Sub worksheet_change(ByVal target As Range)
Dim myrng  As Range
Set myrng = Range(Sheets("Verification Edit Form").[B9], Sheets("Verification Edit Form").[B65536])
If Not Intersect(target, myrng) Is Nothing Then
    Select Case target.Value
        Case 0, 123456789, 987654321, 222222222, 333333333, 444444444, 555555555, 666666666, 777777777, 888888888, 999999999, 123456789
            target = ""
    End Select
    If Len(target) <> 9 Then
            target = ""
    End If
End If
End Sub
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