If undefined dont show text that says undefined

Curious to know, I am using flash, .Net, and MySQL and have elements (text fields) posting in flash.

Question is, if the table in the data base is not holding the var char how can I set the text field in flash to not show undefined and just be blank?

I am about to search the heck out of this but if anyone can hit me with some insight it would be much appreciated.

Thanks in advance,
MT