Hi,
When you bound the drop down to the data connection did you set the Item Value and Item Text properties in this dialog
If you had set the Item Value to the ClientID, that would get the client name and the client id into the dropdown control of the form, then this.boundItem(xfa.event.change) when xfa.event.change contains a value from Item Text will return the Item Value (or the client id in your case)
Regards
Bruce
.