Why does visual studio 2008 break my web page?
问题 I have a aspx page that has a UpdatePanel and a asp timer. the timer tick is the trigger for the update panel. If add anything to the update panel (even a space!) Visual Studio automagically adds the following <Triggers> <System.Web.UI.AsyncPostBackTrigger ControlID="tm1" EventName="Tick"></System.Web.UI.AsyncPostBackTrigger> </Triggers> Even though the page has already registered the following (albeit in the same triggers section) <Triggers> <asp:AsyncPostBackTrigger ControlID="tm1"