本文还将描述如何构建一个弹出对话框控件，它可以在对话框显示时从服务器异步检索对话框内容。
I also describe how to build a pop-up dialog control that asynchronously retrieves the dialog content from the server when the dialog is displayed.
在本文中，学习如何构建一个更新面板控件，该控件可以根据用户活动动态地从服务器异步检索内容。
Within this article, learn how to build an update panel control that dynamically retrieves content asynchronously from the server, based on user events.
服务器向浏览器发送初始页面，后者发出调用以检索更新后的内容。
The server sends an initial page to the browser, which then makes calls to retrieve updated content.
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