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Click Yes to allow the Switchboard Manager to continue. After it builds a skeleton switchboard form and a Switchboard Items table (or after it establishes that you already have these objects in your database), it displays the main Switchboard Manager window. Unless your application is very simple, you won t be able to provide all the navigation your users need on one switchboard with eight options especially considering that you should use one of the options to provide a way for the user to exit the application. So, you should plan additional switchboards that the user can navigate to from the main switchboard. One way to lay out the additional switchboards is to plan one switchboard for each major subject or group of similar features in your database. You should first define all the switchboards that you need (called pages in the wizard) because a page must be defined before you can create a button to navigate to or from the page. To build an additional switchboard page, click the New button and enter a name for the new switchboard in the Create New dialog box, as shown in Figure 24-21 on the next page. Click OK to create the page. 949

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The second parameter indicates that the object should be considered dirty and forces the context to add the object to the list of changed objects. If you don t have the liberty of enhancing your database schema to include timestamp columns and you need to use Attach like this, you can set the UpdateCheck property on the mapping so that the values are not checked. In both of these cases, all properties will be updated, regardless of whether or not they have been changed. If you retain a copy of the original object (either via a cache or by keeping a copy inside the entity itself), attach the new object by using the Attach method and including both the changed version along with the original version:

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context.Subjects.Attach(changedSubject, originalSubject);

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5 The kernel builds various strings and version information, which are displayed on the boot screen through Bootvid if the sos boot option was enabled This includes the full version information, number of processors supported, and amount of memory supported 6 The power manager s initialization is called 7 The system time is initialized (by calling HalQueryRealTimeClock) and then stored as the time the system booted 8 On a multiprocessor system, the remaining processors are initialized by KeStartAllProcessors and HalAllProcessorsStarted The number of processors that will be initialized and supported depends on a combination of the actual physical count, the licensing information for the installed SKU of Windows, boot options such as numproc and onecpu, and whether dynamic partitioning is enabled (Windows Server 2008 systems only) After all the available processors have initialized, the affinity of the system process is updated to include all processors 9.

After you create the additional switchboard pages that you need, you can select one in the main Switchboard Manager window and click the Edit button to begin defining actions on the page. You ll see a window similar to the one shown in the background in Figure 24-22. Use this window to create a new action, edit an existing action, or change the order of actions. Figure 24-22 shows a new action being created. When you create a new action, the Switchboard Manager places a button on the switchboard page to execute that action. In the Text box, enter the caption that you want displayed next to the button. Note that you can enter an ampersand (&) before one of the letters in the caption to make that letter the access key for the button. Choose the action you want from the Command drop-down list. The Switchboard Manager can create actions such as moving to another switchboard page, opening a form in add or edit mode, opening a report, switching to Design view, exiting the application, or running a macro or a Visual Basic procedure. If you choose an action such as opening a form or report, the Edit Switchboard Item dialog box shows you a list of appropriate objects in the second drop-down list.

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On the main switchboard page, you should create actions to open other pages and an action to exit the application. On each subsequent page, you should always provide at least one action to move back through the switchboard-page tree or to go back to the main switchboard page, as shown in Figure 24-23. 950

In this case, only the changed columns will be included in the Update clause, rather than an update being forced on all columns. The original values will be used in the Where clause for concurrency checking. If you can t take advantage of any of these Attach scenarios, you can replace the originalSubject with one newly fetched from the database as part of the update transaction as shown in listing 7.7.

Figure 24-23. Creating an action to return to the main switchboard form from another switchboard form.

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