I have 3 textboxes (all required entries) and a dropdownlist on my Webform. Each textbox has a required field validator associated to it. The dropdownlist should be populated using the textbox values. In addition to the 3 textboxes, a selection from the dropdownlist is required before the user can 'Submit' the transaction. I looked at 2 different ways to possibly do this:<BR><BR>1) Add textchanged events for the textboxes so that when all 3 are entered, the dropdownlist can be populated. However, the textchanged events are not firing when the textbox is filled via autocomplete (I have autopostback set to true). I don't want to turn off autocomplete.<BR><BR>2)Add a 'click' event to the dropdownlist to populate it based on the 3 textbox values but I don't know how to do this (would this be a 'custom' event?).<BR><BR>I think 2) would be a better solution. I'm a newbie so any help will be appreciated.