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that correspond to the version of Access used to create the database, or the drivers for the correct version of SQL Server if you re publishing data from an Access project file. If you re using the Web server on a machine where you have Office 2003 installed (your machine is both the Web client and server), you have the correct drivers installed.

The export to Active Server Page feature in Access requires that you create a data source name (DSN) definition on the server that points to your database. To work properly, the DSN must be a system DSN one that can be used by operating system services. If you plan to publish your Active Server Page on a Web server running on another machine, you must create a system DSN on that machine that connects to your database. Note A system DSN is an entry in your computer s registry, so you won t find a sample file that you can install to create the DSN. You must follow the steps shown here to create the system DSN in order to perform the exercises in this section and open the sample Active Server Pages. To create a system DSN, you must open the ODBC Data Source Administrator. Open Windows Control Panel, double-click Administrative Tools, and then double-click Data

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When SubmitChanges is called on the DataContext D, the Update statement is generated and issued to the server. If no matching record is found based on the previous values passed in the WHERE clause, the context will recognize that no records are affected as part of this statement. When no records are affected, a ChangeConflictException is thrown. Depending on the situation, the number of parameters needed to implement optimistic concurrency can cause performance issues. In those cases, we can refine our mappings to identify only the fields necessary to ensure that the values didn t change. We can do this by setting the UpdateCheck attribute. By default, UpdateCheck is set to Always, which means that LINQ to SQL will always check this column for optimistic concurrency. As an alternative, we can set it to only check if the value changes (WhenChanged) or to never check (Never). If we really want to draw on the power of the UpdateCheck attribute and have the ability to modify the table schema, we can add a RowVersion or TimeStamp column to each table. The database will automatically update the value of the RowVersion each time the row is changed. Concurrency checks only need to run on the combination of the version and ID columns. All other columns are set to UpdateCheck=Never and the database will assist with the concurrency checking. We used this scheme for the Author class mapping back in chapter 7. Listing 8.3 illustrates the revised Author class, applying the same change as we did in the previous example. Using the TimeStamp column, we can see a streamlined WHERE clause in the Update statement.

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Microsoft Office Access 2003 Inside Out Sources (ODBC). Click the System DSN tab, as shown in Figure 26-15, to begin defining your data source.

As we discussed earlier in this chapter, LINQ to XML provides a powerful approach to creating XML elements, referred to as functional construction. Functional construction allows a complete XML tree to be created in a single statement. As an example, let s look at how we can create the following XML using functional construction.

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Last known good (LKG) is a useful mechanism for getting a system that crashes during the boot process back to a bootable state. Because the system s configuration settings are stored in HKLM\SYSTEM\CurrentControlSet\Control and driver and service configuration is stored in HKLM\SYSTEM\CurrentControlSet\Services, changes to these parts of the registry can render a system unbootable. For example, if you install a device driver that has a bug that crashes the system during the boot, you can press the F8 key during the boot and select last known good from the resulting menu. The system marks the control set that it was using to boot the system as failed by setting the Failed value of HKLM\SYSTEM\Select and then changes HKLM\SYSTEM\Select\Current to the value stored in HKLM\SYSTEM\Select\LastKnownGood. It also updates the symbolic link HKLM\SYSTEM\CurrentControlSet to point at the LastKnownGood control set. Because the new driver s key is not present in the Services subkey of the LastKnownGood control set, the system will boot successfully.

Click the Add button to open the Create New Data Source dialog box, as shown in Figure 26-16.

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