Unfortunately you can't control your UI by .Net code.  Keep in mind that your
form could be displayed in IE as html (xml + xsl).  Your code couldn't make
it there, as a result, IP doesn't support that functionality.  The only way
to achieve "advanced" behavior from your UI (not provided by IP) is to
manipulate your xsl file by hand.

Franck Dauché

Hi Xin Chen,

Frank is correct - InfoPath is completely data driven so you do not have
programmatic access to the controls. However, you can achieve what you want
through "Conditional Formatting."

- Right-click on your text box and choose Properties
- Select the Display tab
- Click the Conditional Formatting button
- Click Add
- From the first box, select your option button field
- From the second box, select "is equal to"
- From the third box, choose Type a number and enter the value to test
against (i.e. if you have 2 option buttons typically these have values of 1
and 2)
- Select the formatting you desire (i.e. hiding the control, making it
read-only, etc.)

I hope this helps!

Scott L. Heim
Microsoft Developer Support

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