InfoPath Dev

I am trying to populate a dropdown in infopath form, based on xml returned by a sharepoint webservice. (I know what u are thinking, why code? I need to perform some business logic before populating it) The problem i am facing is that I do not know how to add the items to the drop-down. I found this,...

I have an InfoPath form with custom C# code, and a Sharepoint list. I have a dropdownlist in the InfoPath form that I want to populate with a certain field from the Sharepoint list (I want the InfoPath dropdownlist to contain this field's value from every item in the Sharepoint list. I can successfully...