The update panel control supports optional arguments that are passed along with the asynchronous request for the update panel.
更新面板控件支持可选参数，它们随更新面板的异步请求一同传递。
The update panel control supports optional arguments that are passed along with the asynchronous request for the update panel.
更新面板控件支持可选参数，它们随更新面板的异步请求一同传递。
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