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Suppose you want to do a more complex search on the frmContacts form using criteria such as contact type, company, or products owned rather than simply using contact name. You could teach your users how to use the Filter By Form features to build the search, or you could use Filter By Form to easily construct multiple OR criteria on simple tests. But if you want to find, for example, all contacts who own the Single User edition or whom you contacted between certain dates, there s no way to construct this request using standard filtering features. The reason for this is that when you define a filter for a subform (such as the Events subform in frmContacts) using Filter By Form, you re filtering only the subform rows. You re not finding contacts who have only a matching subform row. The only solution, then, is to provide a custom Query By Form that provides options to search on all the important fields and then build the Where clause to solve the search problem using Visual Basic code. To start, open the LawTrack Contacts application. (If you have exited to the Database window, you can start the application by opening frmSplash.) Sign on, click the Contacts button on the main switchboard form, and then click the Search button in the Select Contacts dialog box. You should see the fdlgContactSearch form, as shown in Figure 23-15 on the next page.

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UPDATE [Book] SET [Price] = @p8 WHERE ([ID] = @p0) AND ([Isbn] = @p1) AND ([Notes] IS NULL) AND ([PageCount] = @p2) AND ([Price] = @p3) AND ([PubDate] = @p4) AND ([Summary] IS NULL) AND ([Title] = @p5) AND ([Subject] = @p6) AND ([Publisher] = @p7)

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Although this code may appear to be excessive, the first two lines accomplish the update. The rest is in place to check for concurrency violations. We will look at concurrency in chapter 8. What is important at this point is to observe that the change manager of the DataContext object recognized that the only column that needs to be changed in our database is the Price field. It does not try to update any other columns or records. This reduces the amount of data we need to transmit across the network. We re also able to queue up multiple updates into a single unit of work and commit them with a single call to SubmitChanges. We ve seen

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Figure 23-15.

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partitions, which can contain extended partitions, and so on, making the number of volumes an operating system can place on a disk effectively infinite. Figure 13-1 shows an example of a hard disk layout, and Table 13-1 summarizes the files involved in the BIOS boot process. (You can learn more about Windows partitioning in 8, which covers storage management.)

Try selecting contacts whose last name begins with the letter G, whom you contacted between February 15, 2003, and April 1, 2003, and who own the Demo Edition Single User product (from the Owns Product drop-down list). When you click the Search button, you should see the frmContacts form open and display two contacts. To see how this works, you need to explore the design of the fdlgContactSearch form. Switch to the Database window (press F11), and open the form in Design view. You should see a window like that shown in Figure 23-16. Notice that the form is not bound to any record source. The controls must be unbound so they can accept any criteria values that a user might enter.

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