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As a Web developer, you have probably been unable to avoid hearing the buzz about Silverlight . Until now, the only effective way to produce dynamic Web content has been through Macromedia Flash . Flash is a plug-in for rendering dynamic content over the Web (that is, animations) . However, with the advent of WPF and its dynamic content capabilities, now there is a markup technology that rivals Flash in raw capability if you can find a way to deliver it to the browser . Although other dynamic content technologies certainly have worked, they have had some serious shortcomings for developers . Silverlight changes this . Silverlight is a platform-independent WPF rendering engine . Without Silverlight, the only way to render WPF content in a browser is to run Internet Explorer or the Firefox browser with the XAML plug-in . Silverlight is packaged as an ActiveX Control for the Microsoft environment . For example, the Apple Safari browser is supported by Silverlight . Visual Studio 2010 includes full support for Silverlight applications . You visit Silverlight in 24 .

There are many scenarios in which you might want to share contextual information between the view that is hosting a region and a view that is inside a region. For example, a master detail like view shows a business entity and exposes a region to show additional detail information for that business entity. The Prism Library uses the RegionContext to share an object between the host of the region and any views that are loaded inside the region, as shown in the following illustration.

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Right-click the project node in the Visual Studio Solution Explorer . Click Add New Item . Select Text File from the available templates . Be sure to name the file with an .xaml extension . At the top of the file, add a beginning <Page> tag and an ending </Page> tag . Using WPF within XAML requires the standard WPF namespace http://schemas . microsoft .com/winfx/2006/xaml/presentation and the keywords namespace http://schemas .microsoft .com/winfx/2006/xaml (which is often mapped to x ) . Use the <Canvas> opening tag and the </Canvas> closing tag . Nest objects you d like displayed in the canvas between the opening and closing tags . Nest objects you d like to appear on the canvas between the <Canvas> opening tag and the </Canvas> closing tag . Assign positions within the canvas using the Canvas.Top and Canvas.Right properties . Declare a <Grid> opening tag and a </Grid> closing tag on the page . Use the Grid s RowDefinitions and the Grid s ColumnDefinitions properties to define the rows and columns . Nest objects you d like to appear on the canvas between the <Grid> opening tag and the </Grid> closing tag . Assign positions within the grid using the Grid.Row and Grid.Column properties . Select File, New Project in Visual Studio . From the Windows application templates, choose WPF Browser Application . Visual Studio will create an XBAP application for you, starting with a simple page . Add WPF controls and handlers to the page . If you want to run the XBAP contront from an ASP .NET site, just make sure the XBAP,exe, and manifest files are available to the ASP .NET Web Project .

Marking the <script> tag containing the ShowLineage method with the runat=server attribute causes ASP .NET to execute the code on the server . But although classic ASP interprets the script block using the designated script language, ASP .NET has an entirely different execution model the whole page is actually compiled into a class that runs under the Common Language Runtime (CLR) . Here s how the ASP .NET compilation model works .

Using Data Annotation Attributes The System.ComponentModel.DataAnnotations namespace in the .NET Framework contains a series of attributes that you can add to your classes and class members to signify metadata for these classes and members. They include a range of validation attributes that you can use to apply validation rules to your classes in much the same way as you can with the Validation block attributes. For example, the following shows how you can use the Range attribute to specify that the value of the property named OnOrder must be between 0 and 50.

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