asp.net create qr code Anatomy of an ASP.NET Page in C#

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5 Anatomy of an ASP.NET Page
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memory structure and then persisted to storage medium. By default, the persistence medium is a hidden field named __VIEWSTATE. Serialization to, and deserialization from, the persistence medium is handled through a couple of overridable methods on the Page class: SavePageStateToPersistenceMedium and LoadPageStateFromPersistenceMedium. For example, by overriding these two methods you can persist the page state in a server-side database or in the session state, dramatically reducing the size of the page served to the user. Hold on, though. This option is not free of issues, and we ll talk more about it in 19.
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Note The view state of the page and all individual controls is accumulated in a unique
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Generating the Markup
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The generation of the markup for the browser is obtained by calling each constituent control to render its own markup, which will be accumulated in a buffer. Several overridable methods allow control developers to intervene in various steps during the markup generation begin tag, body, and end tag. No user event is associated with the rendering phase.
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The Unload Event
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The rendering phase is followed by a recursive call that raises the Unload event for each control, and finally for the page itself. The Unload event exists to perform any final cleanup before the page object is released. Typical operations are closing files and database connections. Note that the unload notification arrives when the page or the control is being unloaded but has not been disposed of yet. Overriding the Dispose method of the Page class or more simply, handling the page s Disposed event provides the last possibility for the actual page to perform final clean up before it is released from memory. The page processor frees the page object by calling the method Dispose. This occurs immediately after the recursive call to the handlers of the Unload event has completed.
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Summary
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ASP.NET is a complex technology built on top of a substantially thick and, fortunately, solid and stable Web infrastructure. To provide highly improved performance and a richer programming toolset, ASP.NET builds a desktop-like abstraction model, but it still has to rely on HTTP and HTML to hit the target and meet end-user expectations. It is exactly this thick abstraction layer that has been responsible for the success of Web Forms for years, but it s being questioned these days as ASP.NET MVC gains acceptance and prime-time use. A thick abstraction layer makes programming quicker and easier, but it necessarily takes some control away from developers. This is not necessarily a problem, but its impact depends on the particular scenario you are considering.
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Part II
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ASP.NET Pages and Server Controls
There are two relevant aspects in the ASP.NET Web Forms model: the process model and the page object model. Each request of a URL that ends with .aspx is assigned to an application object working within the CLR hosted by the worker process. The request results in a dynamically compiled class that is then instantiated and put to work. The Page class is the base class for all ASP.NET pages. An instance of this class runs behind any URL that ends with .aspx. In most cases, you won t just build your ASP.NET pages from the Page class directly, but you ll rely on derived classes that contain event handlers and helper methods, at the very minimum. These classes are known as code-behind classes. The class that represents the page in action implements the ASP.NET eventing model based on two pillars: the single form model (page reentrancy) and server controls. The page life cycle, fully described in this chapter, details the various stages (and related substages) a page passes through on the way to generate the markup for the browser. A deep understanding of the page life cycle and eventing model is key to diagnosing possible problems and implementing advanced features quickly and efficiently. In this chapter, I mentioned controls several times. Server controls are components that get input from the user, process the input, and output a response as HTML. In the next chapter, we ll explore the internal architecture of server controls and other working aspects of Web Forms pages.
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