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When you have two entities with a relationship, such as Customer and CustomerAddress, and you run a query to retrieve a customer, the CustomerAddresses collection is not populated. A second query is executed when you enumerate items of the CustomerAddresses collection. If you look carefully at the SQL generated for the earlier Select query example, shown in Figure 18-5, you will see that after a customer such as AW00000001 is displayed on the screen, a SELECT statement is executed to retrieve the address for that customer. This behavior of loading data only when needed is called deferred loading. If you wish, you can change the framework s default behavior to one of preloading. You make that change using the DataLoadOptions class and its LoadWith method. The LoadWith method accepts a lambda expression as a parameter. You can specify which collection to load, thus preventing the DataContext class from deferring loads for that class. The following shows a code snippet in which territories for a region are retrieved as soon as the parent record for that region is retrieved. AdventureWorksDataContext db = new AdventureWorksDataContext(); DataLoadOptions dlo = new DataLoadOptions(); dlo.LoadWith<Customer>(c => c.CustomerAddresses); db.LoadOptions = dlo; db.Log = Console.Out;

Although you make some additions to the generated code that we highlight in this recipe, there are no code files other than the default code generated by the Silverlight Business Application project template. We cover the generated code in detail for this recipe as a baseline for the recipes in the rest of this chapter. Also, because the Silverlight Business Application template is based on the Silverlight Navigation Application Project, which we cover in Recipe 6-10, we do not go into detail about the page navigation and other functionality brought in by that application template. The Silverlight Business Application template defines the RIA link between the Silverlight application and the web application. You can verify this by looking at the Silverlight application properties shown in Figure 9-1.

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IQueryable<Customer> query = from c in db.Customers select c; foreach (Customer customer in query) { Console.WriteLine(customer.AccountNumber); Console.WriteLine("-=-=-=-=-=-=-=-=-=-=-=-=-="); foreach (CustomerAddress address in customer.CustomerAddresses) { Console.WriteLine(address.AddressTypeID); } Console.WriteLine("-=-=-=-=-=-=-=-=-=-=-=-=-="); } When the CustomerAddresses collection is used to print territory descriptions, no other query is executed, and preloaded data is used instead. The output in Figure 18-21 demonstrates this behavior.

Caution This coding scenario assumes some knowledge of isolated storage and caching mechanisms. If you

Figure 9-1. Silverlight application properties with the RIA link property highlighted When the RIA link is established, any domain services created in the TestWeb web application are made available within the Silverlight project via the code-generation functionality built into the .NET RIA Services framework. Figure 9-2 shows the Solution Explorer tool window for Recipe 9-1 with hidden files and folders displayed and all folders expanded.

The LINQ to SQL framework and its O/RM tools allow you to execute both a stored procedure and a SQL user-defined function using an entity. If you use the SQLMetal tool, you need to include the /sprocs option to generate code to use every stored procedure within the database. If you use Visual Studio s LINQ to SQL Classes Designer, you can drag the stored procedure from the Server Explorer window and drop it onto the designer surface as usual. The stored procedure s name will appear in the top-right corner of the designer. For example, drag and drop the uspGetEmployeeManagers stored procedure, as shown in Figure 18-22.

have worked with ASP.NET caching, Enterprise Library based caching, or other caching forms, this will be very familiar to you. If you need additional information on isolated storage, see http://silverlight.net/quickstarts/isolatedstorage.aspx.

Figure 9-2. Recipe 9-1 project contents You see the typical project layout for the Silverlight Navigation template with the Assets and Views folders along with App.xaml and MainPage.xaml. With hidden folders displayed, you also see a folder named Generated_Code with a generated code file named Ch09_LOBApplications.TestWeb.g.cs. This code file is brought in via .NET RIA Services code generation and is tied to the TestWeb web project, which is also where the file gets its default name. Before we go through the rest of the Recipe 9-1 Silverlight application, we need to cover the TestWeb project contents (see Figure 9-3).

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