Sylvain answered your question. I just want to add that

empty(lcAVar)

is faster than

len(allt(lcAVar)) = 0

It is also more clear.

Vlad

>What is wrong with my code??
>
>*** Variables:
>mswhere1 = ''
>mswhere2 = ''
>director = "'Brady'"
>
>mswhere3 = iif(len(allt(director)) = 0,; mswhere2,iif(allt(len(mswhere2)) = 0, director,;
> mswhere2 + ' and ' + director))
>
>*******
>I got the error 'Function argument value, type, or count is invalid'
>
>Thanks a lot.