Gets the postback element that initiated the asynchronous postback.
取得将非同步处理回传初始化的回传项目。
Raised before the processing of an asynchronous postback starts and the postback request is sent to the server.
会在非同步回传的处理开始之前，以及回传要求传送到伺服器之前引发。
Raised after the response from the server to an asynchronous postback is received but before any content on the page is updated.
在收到服务器对异步回发的响应之后、页上任何内容更新之前引发。
NET AJAX enables you add entries to a browser's history stack that are linked to a specific state of a Web page, such as the state that is created by an asynchronous postback.
NETAJAX使您可以向浏览器的历史记录堆栈中添加条目，这些条目链接到网页的特定状态，例如通过异步回发创建的状态。
NET AJAX enables you add entries to a browser's history stack that are linked to a specific state of a Web page, such as the state that is created by an asynchronous postback.
NETAJAX使您可以向浏览器的历史记录堆栈中添加条目，这些条目链接到网页的特定状态，例如通过异步回发创建的状态。
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