Hi Cindy,

The check box can have a third state - greyed-out or unknown. If the control source is numeric, a value of 2 will put it in this state. If the control source is logical, a .null. will put it in that state. For yes/no answers, a check for isnull will tell whether the user has answered the question.

Another alternative is to use an option group. Setting the initial value to 0 will mean that no answer is selected. You can ensure that the value of the control is >0 before allowing the user to leave the form.

Cheers,

Andrew

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>>>VFP 6.0 . I need to restrict the entry of a text box on a form to a "Y" or "N" entry. Is there an easy way to restrict the text box entry. The user must not be able to skip the field without a valid entry.
>>>
>>>TIA
>>>
>>>Rob
>>
>>Perhaps a checkbox? That's the proper control for a true/false.
>
>Craig,
>
>One of the problems with that (from my clinical trials days when everything was super picky) is that you can't tell the difference between a skipped answer and .F.