In ASP.NET 1.x, the spawned page can access the page object representing its caller by using the Handler property of the HTTP context object, as shown here.
对于ASP.NET 1. x，可以通过使用http上下文的Handler属性获取调用对象，象下面所示。
It first calls the restorer, which cleans up all the click-and-drag handlers, and then it calls the original onmouseup handler that the caller supplied.
它首先调用还原器，以清除所有的点击-拖动处理程序，然后调用调用者提供的原始的onmouseup处理程序。
If the previous method also has no exception handler, the exception is propagated back to that method's caller, and so on.
如果前一个方法也没有异常处理程序，则异常被传播回该方法的调用方，依此类推。
If the previous method also has no exception handler, the exception is propagated back to that method's caller, and so on.
如果前一个方法也没有异常处理程序，则异常被传播回该方法的调用方，依此类推。
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