I have a list box and a command button on a userform. When the command
button is clicked I want to test to ensure the user has selected only 1 item
in the listbox. I have this but it doesn't work and I don't know why, any
ideas?

' ensure a part number is selected to edit
If lbxPreview.Value = Null Then
MsgBox "Please select a Part Number from the list to edit.",
vbCritical
Exit Sub
End If

--
Cheers,
Ryan