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If we use the KeepChanges option, we don t need to inspect the changed values. We assert that our values are correct and go ahead and force them into the appropriate row. This last-in-wins method can be potentially dangerous. Columns that we didn t update will be refreshed from the current value in the database. If the business needs demand it, we could merge the changes with the new values from the database; simply change RefreshMode to KeepCurrentValues. This way, we ll incorporate the other user s changes into our record and add our changes. However, if both users changed the same column, the new value will overwrite the value that the first user updated. To be safe, we can overwrite the values that the second user tried to change with the current values from the database. In that case, use RefreshMode.OverwriteCurrentValues. At this point, it would not be beneficial to submit the

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The standard query operators provided by the LINQ framework allow queries to be a first-class language construct in C# and VB.NET. As we learned earlier in this book, the standard query operators operate over a sequence, where the sequence is an object whose type implements the IEnumerable<T> or IQueryable<T> interface. In the case of LINQ to XML, the some type T is typically an XElement, XAttribute, or XNode. In order to use the standard query operators with our XML data, we need to be able to search our XML for a sequence of objects that can then be queried using the standard query operators. The LINQ to XML axis methods provide a means by which we can find the elements, attributes, and nodes that we want to work with within our XML. Throughout this section we re going to introduce you to the various axis methods and explain when to use each. Once we have a firm handle on the axis methods, we ll look at how we can use them along with the standard query operators. To get started, let s look at the sample XML file that we ll use throughout this section for learning about the axis methods. The XML in listing 10.1 represents a subset of the books within our LINQ Books catalog.

The four panes in the figure illustrate ways you can implement an Access application, as follows:

Server and link the tables over a network into multiple desktop databases so that several users can share the same application.

At the risk of using a clich , the possibilities are endless... In this chapter, you ve had a chance to look at the major objects in the Housing Reservations and LawTrack Contacts sample databases. You ve also been introduced to the architecture of Access and the wide range of ways that you can use Access. You should be feeling comfortable that you can learn to use Access at the level appropriate to solve your database application needs. Perhaps the most important aspect of building an application is designing the database that will support your application. The next chapter describes how you should design your database application and its data structures. Building a solid foundation makes creating the forms and reports for your application easy.

Complete PC Restore Called ASR (Automated System Recovery) in previous versions of Windows, this restores a Windows installation from a complete backup, not just a system restore point, which may not contain all damaged files and lost data Windows Memory Diagnostic Tool Performs memory diagnostic tests that check for signs of faulty RAM Faulty RAM can be the reason for random kernel and application crashes and erratic system behavior Command Prompt For cases where troubleshooting or repair requires manual intervention (such as copying files from another drive or manipulating the BCD), you can use the command prompt to have a full Windows shell that can launch any Windows program unlike the Recovery Console on earlier versions of Windows, which only supported a limited set of specialized commands.

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<category name="Technical"> <category name=".NET"> <books> <book>CLR via C#</book> <book>Essential .NET</book> </books> </category> <category name="Design"> <books> <book>Refactoring</book> <book>Domain Driven Design</book> <book>Patterns of Enterprise Application Architecture</book> </books>

Application Design Fundamentals . . . . . .53 An Application Design Strategy . . . . . . . .57 Data Analysis . . . . . . . . . . . . . . . . . . . . . .64 Database Design Concepts . . . . . . . . . . . 67 When to Break the Rules . . . . . . . . . . . . . 79

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