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When you develop web-based applications, managing user state and implementing a secure robust application are high on the list of requirements. On the Internet, ensuring state and application integrity (i.e., authorization, authentication, and auditing) is even more important because of the wild nature of the Web. In this section, we provide a quick overview of the ASP.NET request processing architecture. While not strictly required for server control development, understanding the basics of the ASP.NET processing architecture, as well as HttpModules and HttpHandlers, can help a developer understand where to plug in custom server controls or where an HttpModule or HttpHandler may be more appropriate. When a browser client makes a request to Internet Information Services (IIS) for a resource such as an .aspx file, by default, ASP.NET initiates and then maintains user state for the duration of the user s site interaction, which can include multiple request/response HTTP sessions. Figure 3-1 shows the logical data flow for a typical ASP.NET request. The request is made to IIS, which checks the file extension mappings to determine how to handle the request. If it is an ASP.NET request, IIS hands off the request to the ASP.NET Internet Server Application Programming Interface (ISAPI) library, aspnet_isapi.dll. That library next funnels the request into the ASP.NET pluggable architecture, handing off the request to the ASP.NET worker process, aspnet_wp.exe.

Summary

In this chapter you tackled two key enhancements that were introduced in ASP.NET 2.0: themes and master pages. Armed with these tools, you can create a complete, integrated web application that has a unified look and feel and a consistent layout. In the next chapter, you ll learn how to add navigation controls to the mix.

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process outside of IIS and the ASP.NET ISAPI extension. The external process that actually does all the processing work for an ASP.NET request is aptly named the ASP.NET worker process. The ASP.NET ISAPI extension is responsible for starting and monitoring the ASP.NET worker process. At any given point in time, you can only have as many worker processes running as you have processors on the system. If you have one processor, then you can only have one worker process. If you have four processors, then you can have up to four worker processes. If the worker process crashes, hangs, or hits predefined performance limits, then the ASP.NET ISAPI extension simply kills the process and starts a new worker process in its place.

avigation is a fundamental component of any website. ASP.NET 1.x had plenty of raw tools, but you were forced to cobble together your own navigation solutions. ASP.NET 2.0 addresses this gap by introducing a wide range of navigation features. In this chapter, you ll tackle three core topics: The MultiView and Wizard controls: These let you boil down a series of steps into a single page. The new site map model: This lets you define the navigation structure of your website and bind it directly to rich controls. You ll also learn how to extend this framework to support different types of controls and different site map storage locations. The rich navigational controls: These include the TreeView and Menu. Although these controls aren t limited to navigation, they re an ideal match. In this chapter, you ll learn about their wide range of features. Using these controls, the site map model, and master pages, you can build a complete navigation system with minimal effort. Best of all, ASP.NET cleanly separates the data (the information about the structure of your website) from its implementation (the navigational controls). That means you can reorganize, replace, and rename web pages without disturbing your website or editing any code. All you need to do is make the corresponding changes to your application s site map file.

Figure 3-1 ASPNET request data flow The worker process implements the HttpRuntime object, which handles ASPNET requests within the same process space and achieves isolation using separate AppDomains The HttpRuntime object uses an HttpApplicationFactory object to locate the correct AppDomain and create an HttpApplication object to process the request The globalasax file can be used to subscribe to events available via the HttpApplication object User state information for the current user session within the application is made available through the Context property of the HttpApplication-derived object We cover Context in more detail in the ASPNET and ServerSide State Management section At this point in the processing pipeline, any objects that implement the HttpModule class and are registered in the application will have their events fired For example, Session_Start and Session_End are implemented in an HTTP module named SessionStateModule.

The features discussed in this chapter are all new in ASP.NET 2.0. That means if you re a skilled ASP.NET 1.x developer, this is a chapter worth reading in detail.

Note Technically, you could have more than one worker process running per processor because the ISAPI extension attempts to allow the worker process to finish any remaining requests before it terminates the process.

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