that is true, however the vb expression comes in handy if you would like to add characters or spaces between each value, like this:
Function FindLabel ([field 1], [field 2], [field 3])
If [field 3] <> " " then
FindLabel = [field 1] & "-" & [field 2] & "-" & [field 3]
else
FindLabel = [field 1] & "-" & [field 2]
end if
End Function
then the last dash doesn't show up if the last value is null