Function alphanum(Nb As Integer) As String
Const caracteres As String = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
Dim tmp As String
For i = 1 To Nb
Randomize Timer
tmp = tmp & Mid(caracteres, Len(caracteres) * Rnd + 1, 1)
Next i
alphanum = tmp
End Function