InfoPath Dev

I neeed to be able to add the values of some fields to a drop down list and need some help in doing so.

Here's an example of what I'm trying to do:

FirstName1         LastName1

FirstName2         LastName2

The first and last names need to be concatenated with a space in the middle to make a drop down entry.

FirstName1 LastName1

FirstName2 LastName2

 Any help would be greatly appreciated!!

Are those firstnames and lastnames in a repeating group?  If so, you can create a hidden field FullName that has a default value formula concat(FirstName, " ", LastName), and then use that FullName field as the source for your dropdown values.

No they aren't in a repeating group. I did this project a while ago before I learned how to do the repeating tables. The firstnames and lastnames are part of the Main data connection. How would I add these concatenated values individually to the drop down?