>I could not find this info in Help on Format, though I remember, I saw it there. I have a field Status in a table, which could be either A or I (Active/Inactive). I don't want to use combobox for this, so I need to restict textbox values. I can do it in KeyPress event, but I want something simpler...
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>Could you please help me?

A few ideas:
- change your label to "Active?" and then use inputmask Y on the textbox to restrict to Y or N
- use a checkbox. Check indicates Active, no check in InActive

Why don't you want to use a combo?