The Page Life Cycle
A page instance is created on every request from the client, and its execution causes itself and its contained controls to iterate through their life-cycle stages. Page execution begins when the HTTP runtime invokes ProcessRequest, which kicks off the page and control life cycles. The life cycle consists of a sequence of stages and steps. Some of these stages can be controlled through user-code events; some require a method override. Some other stages, or more exactly sub-stages, are simply not marked as public and are out of the developer's control. They are mentioned here mostly for completeness.
The page life cycle is articulated in three main stages: setup, postback, and finalization. Each stage might have one or more substages ...
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