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teams with similar aspirations). It also offers many benefits in terms of creating testdriven code. The greater control of your output is also nice. However, developers need to understand it, review the tradeoffs, and migrate only if they see real advantages. It is tempting to jump to ASP.NET MVC because it is new and gets a lot of buzz. However, the web form model is tested and provides a much more Rapid Application Development (RAD) experience for most web developers. ASP.NET MVC typically involves a lot more code and requires a good understanding of patternbased development. My advice is to make sure you are comfortable with the model before making such a switch.

Figure 7-2 : PostTest.aspx after Green has been selected from the drop-down list As you can see, the page recognizes that you ve selected Green. (You ll have to take my word for it that the text is also displayed in green.) So, given that there s no submit button on this page and pure HTML drop-down lists don t cause a postback, how does the AutoPostBack attribute cause a postback to occur The answer is shown in Listing 7-3, the HTML actually received by the browser. Listing 7-3 The HTML output from the page shown in Listings 7-1 and 7-2

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If you are accustomed to building ASP.NET applications, you need to rethink that approach to understand how an ASP.NET application running under MVC operates. The model that uses postback and ViewState is nonexistent with ASP.NET MVC. Instead, MVC uses a routing engine and a set of controllers that provide you with deeper control over your processing and output, at the expense of some automation. There are, however, a few familiar items that are preserved in ASP.NET MVC, such as master pages, style sheets, membership, and standard page markup. But almost everything else is different, including the process of a page through its life cycle. This lesson gets you started with using this very different web application architecture.

10

After this lesson, you will be able to:

Explain the architecture of an ASP.NET MVC website. Understand the execution life cycle of a request made to an ASP.NET MVC website. Understand the project structure and conventions used by an ASP.NET MVC website. Create a basic ASP.NET MVC website.

For the VPN connection to Blue Yonder Airlines, the user account Blue Yonder Airlines is created with the following settings:

An ASP.NET MVC application has a different architecture, page processing model, conventions, and project structure than an ASP.NET web form site. Requests to an ASP.NET MVC application are handled by the UrlRoutingModule HttpModule. (See 10, Writing and Working with HTTP Modules and Web Services, for more information regarding HttpModules.) This module parses the request and selects a route for that request based on a configuration that you define. Ultimately, the request is routed to one of the many controller classes that you write to manage request processing. It is the selected controller s job to access your data and business logic (the model), connect it for display (the view), and send the response back to the user. The controller handles all requests view and updates (posts). This is considerably different than the basic architecture of an ASP.NET application, in which requests are handled by ASP.NET: it calls your page; it executes your events in order; those events affect the response; and ASP.NET ultimately returns the response. With ASP.NET MVC, you write the model, create the views, and code the controllers; thus you have finer control over how each request is handled and each response is rendered. With ASP.NET MVC, there is less hidden from you (and thus less work done automatically for you). Figure 14-1 shows the high-level architecture of the components you write to manage a request with ASP.NET MVC. As you can see, requests are routed to controllers. The controller works with the data model, selects a view (based on an action), and returns the results.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML> <HEAD> <title></title> <meta name="GENERATOR" content="Microsoft Visual Studio.NET 7.0"> <meta name="CODE_LANGUAGE" content="Visual Basic 7.0"> <meta name="vs_defaultClientScript" content="JavaScript"> <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"> </HEAD> <body> <form name="Form1" method="post" action="PostTest.aspx" id="Form1"> <input type="hidden" name="__VIEWSTATE" value="dDw4MzQ2Mzg4MzY7dDw7bDxpPDE+Oz47bDx0PDtsPGk8Mz47Pjts PHQ8cDxwPGw8V GV4dDtGb3JlQ29sb3I7XyFTQjs+O2w8WW91IHNlbGVjdGV kIEdyZWVuOzI8R3JlZW4+O2k8NT47Pj47Pjs7Pjs+Pjs+Pjs+" />

These components should be familiar to you as a web developer. A controller is a class; the model is either made up of custom classes or generated classes that use the Entity Framework or LINQ to SQL; and the views are ASPX webpages. The following list provides a more detailed definition of these components:

Password of W@8c^4r-;2\. For the account properties of the Blue Yonder Airlines account, the User