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When we fetch data from the database, LINQ to SQL utilizes a technique called deferred execution. With deferred execution, the results are only loaded into memory when they are requested. Stepping through our examples in this chapter and paying attention to when the SQL statements are being generated, we can see that they are not generated when we define the query. Instead, the database is not accessed until we actually request each record. Waiting to access the values until they are needed is called lazy loading.

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balancing by ordering and/or selecting members of a replica set to fulfill a client request for data on the replica set. In addition, DFS achieves high availability by routing requests to the working member or members of a replica set when a member becomes unavailable. The components that make up the DFS architecture are shown in Figure 12-35. The serverside implementation of DFS consists of a Windows service (\%SystemRoot%\System32 \Dfssvc.exe) and a device driver (\%SystemRoot%\System32\Drivers\Dfs.sys). The DFS service is responsible for exporting DFS topology-management interfaces and maintaining the DFS topology in either the registry (on non Active Directory systems) or Active Directory. The DFS driver performs topology lookups when it receives a client request so that it can direct the client to the system where the file it is requesting resides.

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When displaying results, lazy loading offers the benefit of only retrieving the data when we request it, and only returning the data we request. In many cases, this provides performance benefits, but in other cases it can lead to some unexpected results. Consider the code from listing 6.25, which displays the list of subjects that may or may not have associated books. In this case, we will send the generated SQL commands to the console window to be displayed when the request is submitted to the database. When running this example, step through the code and watch the console window carefully to see exactly when each command is being issued.

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Microsoft Office Access 2003 Inside Out look like on a printed page. You ll read more about Print Preview in the next section. For now, close the frmEmployeesPlain window so that only the Database window is visible on your screen.

DataContext dataContext = new DataContext(liaConnectionString); dataContext.Log = Console.Out; var subjects = dataContext.GetTable<Subject>(); ObjectDumper.Write(subjects);

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If your primary need is to print data, you should use an Access report. Click Reports on the Object bar in the Database window to see the list of reports available in the Housing Reservations database, as shown in Figure 2-16.

Although you can print information in a datasheet or a form, neither of these formats provides the flexibility that reports do when you need to produce complex printed output (such as invoices or summaries) that might include many calculations and subtotals. Formatting in datasheets is limited to sizing the rows and columns, specifying fonts, and setting the colors and gridline effects. You can do a lot of formatting in a form, but because forms are designed primarily for viewing and entering data on the screen, they are not suited for extensive calculations, grouping of data, or multiple totals and subtotals in print. Also, a form that is designed to be attractive on screen might not print attractively on paper. At the upper left corner of the Database window are three toolbar buttons to open the selected report in Print Preview or Design view or to begin creating a new report. At the top of the list of reports in the Database window, you can also find two special shortcuts for creating a new report. You can double-click either of these shortcuts to begin defining a new report. You can also view the report in Print Preview by double-clicking the report name in the window, or you can open the report in Design view by holding down the Ctrl key and doubleclicking the report name. Finally, you can right-click any report name and choose Design View from the shortcut menu.

In some applications, it makes sense to save a certain type of record only if prerequisite records exist. For example, in a school or seminar registration application, the user might need to verify that the person enrolling has successfully completed prerequisite courses. In the LawTrack Contacts application, it doesn t make sense to sell support for a product that

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