I'd probably use two controls: one invisible that is bound to the field and one that the user enters their value

>Hi Nancy ---
>
>I think he means to display one value but actually store another in the *same* textbox.
>
>
>>I'm not sure I understand, either, Justok. But do you mean something like the following? You have two text boxes. In one the user enters values 0<= n < 1 and the second textbox should display 100 * 1 - n. You can put the calculation in the refresh code for the second textbox, and put a call to the refresh in the first textboxes lostFocus event or valid.
>>
>>If I guessed wrong, please repost.
>>
>>>In the form, there is a field, discount which is a numeric value less than one. (e.g. 0.87)
>>>
>>>How to set a textbox show value 13 and when user change the value.
>>>it will put into the field value ?!