As shown in the code above, we first get a reference to the Page Request Manager and then wire up the initialize Request and end Request events to execute, when an async postback begins and ends respectively.
When the user initiates a postback by clicking on the button kept inside the Update Panel, we set a delay of 3 seconds.
To display progress to the user, we handle the Initialize Request at the client side and set the to visible.
For example, to change the size of an element we could use The name of the animation and properties are case insensitive in generic XML animation declarations.Since the animation framework is based on a hierarchy of animation classes, all the animations have the properties which runs its child animations sequentially, waiting for each to finish before starting the next.To use these animations in the generic XML animation declaration syntax, we include their child animations as nested XML elements.The image can be found with the source code for this article over here.The Page Request Manager class handles the partial-page updates of the Update Panel.
Accordion 功能：实现了QQ、Msn好友分类的折叠效果，就像包含了多个Collapsible Panels 细节： (1)不要把Accordion放在Table种同时又把 Fade Transitions 设置为True，这将引起布局混乱 (2)每一个 Accordion Pane control 有一个Header 和Content的 template (3)在Content中可以进行任意扩展，你什么都可以放上^_^ (4)有三种Auto Size modes ：None(推荐) Limit Fill (5)Accordion表现的更像是一个容器 4.