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Most websites split tasks across several pages. For example, if you want to add an item to your shopping cart and take it to the checkout in an e-commerce site, you ll need to jump from one page to another. This is the cleanest approach, and it s easy to program provided you use some sort of state management technique (from query strings to session state) to transfer information from one page to another. In other situations, you might want to embed the code for several different pages inside a single page. For example, you might want to provide several views of the same data (such as a gridbased view and a chart-based view) and allow the user to switch from one view to the other without

HttpModule objects can be used to implement a variety of sitewide functionality, such as a custom authentication architecture that verifies requests based on custom HTTP header information After all registered HttpModule objects have a chance to process events, the request is shepherded to the appropriate HTTP handler by calling its ProcessRequest() method The ProcessRequest() method takes one parameter of type HttpContext containing the user state of the current request Next, HttpHandler is responsible for generating a response to the request using the ContextResponseWrite() method This entire process is illustrated in Figure 3-1 As you can see, request processing flows through a series of ASPNET objects that have full access to the ASPNET state The ASPNET classes in Figure 3-2 can examine the state of a user request to implement authentication, authorization, and auditing in a web application.

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leaving the page. Or, you might want to handle a small multistep task (such as supplying user information for an account sign-up process), without worrying about how to transfer the relevant information.

This allows IIS to continue running in the event an ASP.NET application has a serious error. When the ASP.NET worker process starts up, the ASP.NET ISAPI extension uses configuration settings from Machine.config to authenticate an account and give the worker process an appropriate access token to define the security context under which it may run. By default, ASP.NET runs under the least privileged ASPNET/Network Service account. Notice that the ASP.NET ISAPI extension passes the request, server data, and the access token IIS created for the request to the worker process using a named pipe. The server data contain important information used to set up the Server, Request, and Response objects in ASP.NET, and the access token defines the account IIS authenticated. The named pipe is used because IIS and the ASP.NET worker process run in two separate processes. Processes can t directly communicate with one another because they are isolated by the operating system. The isolation is what allows ASP.NET to crash without affecting IIS. Thus, communication between the two processes must occur over a named pipe. Named pipes are operating system mechanisms that allow two processes to pass information back and forth while still maintaining their isolation. At this point, the request resides in the ASP.NET worker process, and IIS waits for a response from the worker process so it can fulfill the request. Now let s take a look at how the worker process handles a request.

From the user s point of view, it probably doesn t make much difference whether you use multiple pages or a page with multiple views. In a well-designed site, the only difference the user will see is that the multiple view approach keeps the same URL. The prime difference is the coding model. With multiple pages, you get improved separation but extra work in determining how the pages should interact (the way they share or transmit information). With multiple views, you lose your separation but get easier coding for small, nondivisible tasks.

Web Parts Framework Concepts: Presents a high-level overview of Web Parts concepts including display modes, page scope, authorization, and how users interact with Web Parts on a page. Web Part Interfaces, Classes, and Controls: Describes the various components in the Web Part framework and how you can use them to complete various tasks. Building Web Parts: Demonstrates how to build Web Parts as user controls or as custom controls and covers personalizable Web Part properties. Advanced Web Part Topics: Explains how to create custom Web Part context-menu items, set up Web Part connections that allow Web Parts to communicate with one another, and export Web Part configuration files to ease the setup process for Web Parts with complicated configuration settings. We ll get started by taking a look at some of the concepts surrounding the Web Parts framework.

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