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For more information about Prism regions, see 7, Composing the User Interface. For more information about the MVVM pattern and Interaction Request pattern, see 5, Implementing the MVVM Pattern and 6, Advanced MVVM Scenarios. For more information about the Interaction Request object, see Using Interaction Request Objects in 6, Advanced MVVM Scenarios. For more information about the Visual State Manager, see VisualStateManager Class on MSDN: http://msdn.microsoft.com/en-us/library/cc626338(v=VS.95).aspx. For more information about using Microsoft Expression Blend behaviors, see Working with built-in behaviors on MSDN: http://msdn.microsoft.com/en-us/library/ff724013(v=Expression.40).aspx. For more information about creating custom behaviors with Microsoft Expression Blend, see Creating Custom Behaviors on MSDN: http://msdn.microsoft.com/en-us/library/ff724708(v=Expression.40).aspx. For more information about the Silverlight Navigation Framework, see Navigation Overview on MSDN: http://msdn.microsoft.com/en-us/library/cc838245(VS.95).aspx. For more information about integrating Silverlight s Navigation Framework with Prism, see Integrating Prism v4 Region Navigation with Silverlight Frame Navigation on Karl Schifflett s blog: http://blogs.msdn.com/b/kashiffl/archive/2010/10/05/integrating-prism-v4-regionnavigation-with-silverlight-frame-navigation.aspx. To access web resources more easily, see the online version of the bibliography on MSDN: http://msdn.microsoft.com/en-us/library/gg405487(PandP.40).aspx.

2 . . Close the browser and open the file List .aspx; it is in Solution Explorer under the Project node: Open the Dynamic Data node, and then open the Page Templates node . After you open List .aspx, switch to Design mode if not already displayed as such . You should see the GridView in Design mode:

3 . . This page is just like any other Web form at this point . If you would like to format the GridView, you can by clicking the SmartTag for the grid (the angle bracket (>) in the box in the upper right corner of the control) . For example, you can auto format the

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The example named Using a Validation Rule Set to Validate an Object creates an instance of the Product class that contains invalid values for all of the properties, and then uses the code shown above to create a type validator for this type and validate it. It then displays details of the validation errors contained in the returned ValidationResults instance. However, rather than using the simple technique of iterating over the ValidationResults instance displaying the top-level errors, it uses code to dive deeper into the results to show more information about each validation error, as you will see in the next section. Delving Deeper into ValidationResults You can check if validation succeeded, or if any validation error were detected, by examining the IsValid property of a ValidationResults instance and displaying details of any validation errors that occurred. However, when you simply iterate over a Validation Results instance (as we demonstrated in the section Performing Validation and Displaying Validation Errors earlier in this chapter), we displayed just the top-level errors. In many cases, this is all you will require. If the validation error occurs due to a validation failure in a composite (And or Or) validator, the error this approach will display is the message and details of the composite validator. However, sometimes you may wish to delve deeper into the contents of a Validation Results instance to learn more about the errors that occurred. This is especially the case when you use nested validators inside a composite validator. The code we use in the example provides richer information about the errors. When you run the example, it displays the following results (we ve removed some repeated content for clarity).

GridView to give it a more colorful appearance . You can also edit the control to have alternating row styles, as shown in 10 . The example here skins the GridView using the Classic format . Here s the DotNetLinks GridView following the reformat:

It is important to maintain a loose coupling between the various components in your application to ensure that it remains flexible and easy to maintain There are various ways to implement loose coupling The most appropriate choice depends on the components involved and the required communication between them In all cases, your goal should be to minimize static dependencies on specific implementations of components while allowing them to communicate efficiently To determine how to achieve this goal, it is important for you to understand the differences between the various approaches so that you can best determine which one to use in your particular scenario In some cases, you may have two components or classes that interact very closely with each other for example, a view and a view model and can achieve loose coupling and communication by using data binding, commands, interaction requests, and so on.

4 . . Now update the Linq to SQL data model to support regular expression validation . The file created by Visual Studio is named DotNetReferences .Designer .cs, and you can edit it by expanding the DotNetReferences .dbml file in Solution Explorer . Find the URL property in the DotNetLink class and add the RegularExpression attribute to it . The regular expression shown here is borrowed from the RegularExpressionValidator s ValidationExpression dialog box:

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