私有视图状态 (private view state) 作为隐藏字段写入的状态信息，例如当前活动的窗体，或者窗体的分页信息等。
可以重写此方法以存储私有视图状态。
当控件保存其私有视图状态时调用此方法。
This method is called when the control saves its private view state.
这些附加信息以私有视图状态存储，并且存储在客户端而不是服务器中。
This added information is stored in the private view state and is stored on the client rather than the server.
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