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Depending on the scenario, you can choose to share a single piece of information (such as an identifier) or a shared model. The view can retrieve the RegionContext, and then sign up for change notifications. The view can also change the RegionContext s value. There are several ways of exposing and consuming the RegionContext: You can expose RegionContext to a region in Extensible Application Markup Language (XAML). You can expose RegionContext to a region in code. You can consume RegionContext from a view inside a region. Note: The Prism Library currently only supports consuming the RegionContext from a view inside a region if that view is a DependencyObject. If your view is not a DependencyObject (for example, you are using WPF automatic data templates and adding your view model directly in the region), consider creating a custom RegionBehavior to forward the RegionContext to your view objects.

When it arrives on the Web server, the HTTP request/response is routed through many server-side objects for processing . Once a request ends up at the server, it winds its way through the IIS/ASP .NET pipeline . The best way to understand the path of an HTTP request through ASP .NET is to follow a request as it originates in the browser and is intercepted by Internet Information Services and your Web application . When an end user presses the Return key after typing in a URL, the browser sends an HTTP GET request to the target site . The request travels through a series of routers until it finally hits your Web server and is picked up on port 80 . If your system has software listening to port 80, the software can handle the request . On the Microsoft platform, the software most often listening to port 80 is IIS . For the time being, ASP .NET works with three versions of IIS: version 5 .x (if you are using the Windows XP Professional operating system), version 6 .x (if you are using the Windows Server 2003 operating system), and version 7 .x (if you are using the Windows Vista, Windows 7, or Windows Server 2008 operating systems) .

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The general flow of the requests is the same, regardless of which version of IIS you choose . IIS maintains a mapping between file extensions and binary components capable of interpreting the request (you see more about the binary components later) . When a request comes in, IIS reads the file name identified in the request and routes the request to the appropriate component . Earlier versions of IIS (prior to version 7 .x) implement such features as client authentication and output caching independently of ASP .NET . That is, IIS and ASP .NET each implement their own versions of these features . IIS 7 .x integrates the ASP .NET versions of these features (some of which you see in future chapters) . As far as the ramifications of IIS 7 .x to ASP .NET developers, running in Integrated mode makes .NET functionality part of the core pipeline . Features such as Forms Authentication can now be applied to a wide range of content not just ASP .NET forms . For example, this helps when trying to secure an entire Web site using a uniform authentication method . For the purposes of illustration, the following graphics show how IIS 7 .x routes requests of various types . The following shows the IIS 7 .x module mappings when running in Integrated mode:

[Range(0, 50, ErrorMessage = Quantity on order must be between 0 and 50.")] public int OnOrder { get; set; }

Also for illustration purposes, the following shows IIS 7 .x handler mappings when running in Integrated mode:

About the DataContext Property Data context is a concept that allows elements to inherit information from their parent elements about the data source that is used for binding. Child elements automatically inherit the DataContext of their parent element. The data flows down the visual tree. The best method for binding a view model to a view in Silverlight is by using the DataContext property; that is why, in most cases, the DataContext is used to store the view s model. Because of this, unless you have very simple views, it is not recommended that you use the DataContext property as a communication mechanism between different loosely coupled views.

In addition to running in Integrated mode, IIS 7 .x also runs in Classic mode to support backward compatibility . When running in Classic mode, IIS 7 .x uses the module and handler architecture to pass processing to specific traditional binary components (that is, ISAPI DLLs) . To illustrate how mappings work in Classic mode, the following graphic shows IIS 7 .x module mappings running in Classic mode:

The following graphic shows IIS 7 .x running in Classic mode and its handlers mappings:

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