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Unfortunately, by converting our results into a List or Array, we lose some of the benefits of LINQ to SQL, specifically the ability to optimize the data we retrieve from the database by leveraging the server-side functionality and limiting the amount of data we have to put into memory. Any query expressions applied to the resulting Subjects list will be processed by LINQ to Objects rather than LINQ to SQL. Simply casting the results ToList still doesn t help eliminate the separate queries to fetch each of the lazy loaded child collections. Fortunately, LINQ to SQL supports a mechanism to instruct the DataContext which optimizations to make. By using a DataLoadOptions type as shown in listing 6.27, we can shape (but not fetch) the result sets ahead of time. As soon as a record of the declared object type is fetched, it will also retrieve the associated child records.

This is arguably some of the simplest example code in any of the sample databases, but this attention to detail will make the users of your application very happy. Note The code also executes when you tab backward into the ContactID and HomeAddress controls or forward into the Notes or Photo controls, or you click in any of the controls. Access realizes that the form is already on the page requested in each case, so it does nothing.

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One of the most common tasks to automate in a database application is filtering data. Particularly when a database contains thousands of records, users will rarely need to work with more than a few records at a time. If your edit forms always display all the records, 887

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DataLoadOptions options = new DataLoadOptions(); options.LoadWith<Subject>(subject => subject.Books); dataContext.LoadOptions = options;

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In this example, we create a new DataLoadOptions object called options B. The main function of DataLoadOptions is to indicate which child objects load with a given object type. Since we want to make sure we load our books whenever we load the subjects, we tell the options to LoadWith<Subject> and pass it a function in the form of an expression C. We could pass an actual delegate, but since we have lambda expressions at our disposal, we can tell it, given a subject, load the Books EntitySet. All that remains is to attach our options to our data context D. With the new options in place, run the example again. Here is the SQL that LINQ generates:

Microsoft Office Access 2003 Inside Out performance can suffer greatly. So it s a good idea to enable the user to easily specify a subset of records. This section examines four ways to do this.

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You work with list boxes all the time in Microsoft Windows and in Microsoft Access. For example, the file list in Windows Explorer is a list box, and the List view in the Access Database window is a list box. In the Database window, you can select only one object from the list at a time. If you click a different object, the previous object is no longer selected this is a simple list box. In Windows Explorer, you can select one file, select multiple noncontiguous files by holding down the Ctrl key and clicking, or select a range of files by holding down the Shift key and clicking this is a multiple-selection list box. Suppose you re using the LawTrack Contacts application (Contacts.mdb) and you re interested in looking at the details for several contacts at one time but will rarely want to look at the entire list. Start the application by opening the frmSplash form, select John Viescas as the User Name, and click Sign On (no password required). Click the Contacts button on the main switchboard form, and the application opens the Select Contacts form (frmContactList). As shown in Figure 23-12, the frmContactList form contains a multiple-selection list box. Note You won t see the Select Contacts dialog box if the Don t Show Contact List option is selected in my user profile. If the Contacts form opens when you click the Contacts button on the main switchboard, close the form and click the Users button. Clear the Don t Show Contact List option in my profile, save the record, and close the form. You should now see the Select Contacts dialog box when you click the Contacts button on the main switchboard.

In this chapter, we ll describe the steps required to boot Windows and the options that can affect system startup. Understanding the details of the boot process will help you diagnose problems that can arise during a boot. Then we ll explain the kinds of things that can go wrong during the boot process and how to resolve them. Finally, we ll explain what occurs on an orderly system shutdown.

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