What is the main purpose of UpdatePanel in ASP.Net? What is the Triggers tag in UpdatePanel?
It allows you to postback without refreshing the entire page. Only the contents of UpdatePanel are updated.
http://msdn.microsoft.com/en-us/library/bb399001.aspx
An UpdatePanelis a set of components that you want to influence ajaxified update in your web application. triggers- This is what causes the component panel to be updated.
UpdatePanel
triggers
asp.net ajax , , Ajax ASP.NET.
Updates are a quick way to get ajaxified, but beware of its flaws.
http://encosia.com/2007/07/11/why-aspnet-ajax-updatepanels-are-dangerous/