I have dropdownlist with WSDL DataSource.
On preOpen event webservice is invoked to populate the dropdown.
it doesn't work in Adobe Reader.
The form must be Reader Extended to allow web services to work in Reader. You will need the server version of Reader Extensions not the one in Acrobat.
I have Reader Extended the form other webservices invoking on form initialize are working fine. Only problem with the webservice invoked at preOpen event of dropdown list. Invoking webservices on event of button is also working fine. The problem occurs while opening the form in Adobe Reader. I'm using the trial version of Reader Extension Server.
Can you simply put a messageBox on the event and validate that the event is firing? Which version of Reader? That event was added recently so it may not be available for that version.