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As an alternative to using the Send To command, you can drag files into the Windows Explorer folder for your CD drive. Or you can use the Copy and Paste commands. When you copy files and folders into the CD drive s folder, by whatever means, Windows prepares them for transfer to a writable CD. The CD folder becomes, in effect, a staging area for the eventual CD burn. While files are being copied to the staging area, you might see a dialog box like this one.

Listing 8.23 includes the two new members. The first, ExpensiveBooks, is a static field that contains the compiled query definition B. The second method acts as a helper method to encapsulate the call to ExpensiveBooks, passing in the containing DataContext instance C. The real work is done in the first method. The function stored in ExpensiveBooks defines a signature that takes a Ch8DataContext and a decimal as input parameters and returns an object that implements the generic IQueryable<Book> interface. We define the function as the result of System.Data.Linq.CompiledQuery. Compile. Compile takes a lambda expression defining our query. It evaluates the structure and prepares the function for use. Since the function is defined as static, it will be evaluated only once in the lifetime of our AppDomain. After that, we re free to use it as much as we want without worrying about most of the evaluation overhead.

The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson and then try the question again. Answers to the questions can be found in the Questions and Answers section at the end of this chapter. 1. What is the difference between redeploying and upgrading an application deployed with Group Policy

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3. What happens if you delete a GPO that deploys a software application before you choose the software removal method you want to implement and allow the software removal to be processed

Microsoft Windows XP Inside Out, Second Edition With some files, Windows Explorer maintains metadata data about the file s data. This information the dimensions of a graphic image, for example, or the bit rate of an audio file cannot be copied to the CD. When you see a Confirm Stream Loss dialog box like the one shown on the previous page, your choices are to skip the file or copy it without its metadata. You can also select the check box to keep Windows from displaying similar messages during the current copy process. After you have moved some files to the CD folder, the folder will look something like Figure 17-6.

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Any time we want to fetch the listing of expensive books, we can call the GetExpensiveBooks method. The framework no longer needs to reevaluate the mappings between the database and the objects, nor will it need to parse the query into an expression tree. This work has already been done. If you re unsure of the impact of using compiled queries, read the series of posts by Rico Mariani beginning with http://blogs.msdn.com/ricom/ archive/2007/06/22/dlinq-linq-to-sql-performance-part-1.aspx. He shows how using a compiled query offers nearly twice the performance of noncompiled queries and brings the performance to within 93 percent of using a raw DataReader to populate objects. As LINQ continues to evolve, there will continue to be more performance enhancements. The other business tier components that we ll discuss are less focused on performance and more focused on code maintainability and reuse. The fine art of programming is all about making trade-offs between these two areas. Often a small performance penalty is outweighed by greatly increased maintainability.

Click one of these links to write the CD or to clear files and start over This banner appears regardless of the view you select

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4. A software application deployed with Group Policy in your organization is no longer used. You no longer want users to be able to install or run the software. What action should you perform a. Execute a forced removal b. Execute an optional removal c. Redeploy the application d. Upgrade the application