InfoPath Dev

I sorted out the problem and now working fine. It is an issue with rules.

I have a dropdown list box in which ID is populating from database. I need to display names in a textbox based on ID. In dropdown list box, value coming correctly. In textbox, first item in the name field is only coming. Not changing once I change the ID. What might be the problem? please help. Thanks in advance, Sam.

I has followed as mentioned in this post. List box is populating id, textbox is populating 1st name. not populating based on id change. Please help.