In InfoPath any of the control will fire change event, it is XML node that
will have change event. So in your case you can have the OnChange event on
the node that Combo box is binded to.
Hey Andrea,
Is there any reason you need to call the web service using code?, if not you
could always setup a data connection to the web service, then you can use
the rules engine to query the data source.
If you need to do this through code then simply add a new event handler for
your drop down then connect to your web service from there.
Hope this helps
Cheers,
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