Format Text. Using DataFormat and TextBox.

I have a Social Security Number field in my Database. It is set up as a text field because some Social Security numbers start with a zero. I have a textbox set up refrencing this field. I use the following dataformat ###-##-#### and it returns the field only it leaves of the Zero in front of those Social Security numbers that have a zero because it is formated as text and must convert to number when using #. I can't seem to get the ???-??-???? to work. Any help would be great???? I have tried "???-??-????", [???-??-????]

Thanks