Page Protected Sub Page_Load(By Val sender As Object, By Val e As System. Load End Sub Protected Sub Drop Down List1_Selected Index Changed(By Val sender As Object, By Val e As Event Args) Handles Drop Down List1. If the content of the dropdown changes, put it inside the updatepanel.
The true means: everytime the value in the drop down changes, a postback to the server will occur. If the drop down will not change, it's a good idea to put it outside the update panel and the update panel must be triggered asynchronous by the drop down (if you don't set a trigger to the update panel, every postback will update your updatepanel).
It works with these federal agencies: The IPO also collaborates with the White House Office of Science and Technology Policy, Office of the Director of National Intelligence, and other critical stakeholders as needed.
=p PS: Microsoft Update Panels are easy to develop but make your site very slow. You need to place your Scriptmanager before any controls that will use it. You also need to set the Auto Post Back property to true on the dropdownlist for the selectedindexchange event to fire on it. if you want to trigger Async-Postback in your Update Panel if the User changes the Drop Down List, you have to specify an Async Postback Trigger for the Update Panel, because the Drop Down is outside of it.
But like I said, I'm not using that for a long time, its a good idea to double check everything I say about the subject.
Update() End Sub End Class Set the autopostback to true in the drop down.
I've never had a problem with frequent updates from Microsoft, however after 10-12 attempts, these updates have failed.