>I have a combo box that has a row source type of fields and the row source is the field name in the database. The database has codes that I want them to pick from. I put in the valid clause:
>
>if this.value != dbf.field
> return .f.
>else
> return .t.
>endif
>
>this works fine when I want them to only pick from the database. The problem is sometimes I want to let them put in a blank and still do the validation. So, I tried:
>
>if !empty(this.value) AND this.value != dbf.field
> return .f.
>else
> return .t.
>endif
>
>the problem is that if you put in a blank or an invalid code this.value is empty. How do I know if they left the field blank or put in an invalid code?

What about making the rowsource an SQL and style dropdown list ?
Rowsource = [select distinct myField from mytable ]+;
[ union ]+;
[select " " as myField from myTable ]+;
[into cursor mycursor]
Cetin