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In the case of objects that have already been updated, simply attaching them to the DataContext will fail. No values would be flagged as needing to be updated, as the change-tracking service will have been unaware of the changes. Here, we need to fetch the record from the database based on the ID of the object that we re trying to update B. Then, we need to update each property as necessary C. If the values in the properties are the same, the change-tracking service will continue to exclude those properties from needing to be updated. When we call SubmitChanges, only the properties and objects that have changed will be submitted. D Be aware that the object we re updating may have been based on values that have been subsequently changed in the database. In order to manage concurrency tracking, our best option is to supply a timestamp that indicates

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If the system was booted with boot logging (with the BCD bootlog option), the boot log file is initialized If the system was booted in safe mode, a string is displayed on the boot screen with the current safe mode boot type 30 The executive is called to execute its second initialization phase, where it configures part of the Windows licensing functionality in the kernel, such as validating the registry settings that hold license data Also, if persistent data from boot applications is present (such as memory diagnostic results or resume from hibernation information), the relevant log files and information are written to disk or to the registry 31 The MiniNT/WinPE registry keys are created if this is such a boot, and the NLS object directory is created in the namespace, which will be used later to host the section objects for the various memory-mapped NLS files 32.

Figure 24-27. Choose the Compile command from the Debug menu to compile all the Visual Basic procedures in your database.

As you ve seen in this book, you can quickly learn to build complex applications. You can use the relational database management system in Access to store and manage your data locally or on a network, and you can access information in other popular database formats or in any server-hosted or mainframe-hosted database that supports the Open Database Connectivity (ODBC) standard. You can get started with macros to become familiar with event-oriented programming and to prototype your application. With a little practice, you ll soon find yourself writing Visual Basic event procedures like a pro. In the next part of this book, you can learn about working with your Access applications on the Web. In the final part, you can learn how to implement your Access application in a client/server environment, secure your database, and prepare your database for distribution.

25 Publishing Data on the Web 26 Creating Static and Dynamic Web Pages 27 Building Data Access Pages 28 Working with XML and SharePoint 961 985 1015 1095

the database version when originally fetching the record. If adding the timestamp column is not an option, we can retain a copy of the original values or a hash of the original values. We can then compare the appropriate values and manage the concurrency ourselves. The DataContext s object identity and change-tracking services play a crucial role in the object s life cycle. If we simply need to read the values, we can set the DataContext to a read-only mode by setting the ObjectTrackingEnabled to false, thus bypassing these services. However, if we need to be able to change and persist the values, tracking the objects and changes is critical.

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Working with the Web. . . . . . . . . . . . . . 961 Maintaining Static Web Pages . . . . . . . 971 Creating Dynamic Web Pages. . . . . . . . 973 Sharing Your Data with SharePoint . . . . 978 Discovering the Possibilities. . . . . . . . . . 979

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