Hi -
You don't need any code behind the checkbox itself, you only need to check its value.
Supposing the checkbox is called SelectAll, you might have something like this:
Code:
'
' Scan through all the listbox items
'
For J = 0 To listboxname.ListCount - 1
'
' If the listbox item is selected OR the Select All box has been checked
'
If me!SelectAll or listboxname.Selected(J) Then
'
' Process the list item
'
End If
Next J
replace listboxname with the actual name of your listbox control.
You would probably use this in the code for a command button.
HTH
John