您知道，当一个页面被跨页投递给另一个页面后，接受页要可以访问投递页的实例。
You see, when a page is cross-page posted the page that is posted to has access to an instance of the page posted from.
这个属性类似现有的IsPostBack但是只有跨页投递发生时返回true。
This property works just like IsPostBack but returns true when a cross-page postback has occurred.
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