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As you can see, not all operators have equivalent keywords in C# and VB.NET. In your simplest queries, you ll be able to use the keywords proposed by your programming language; but for advanced queries, you ll have to call the query operators directly, as you ll see in chapter 4. Also, writing a query using a query expression is only for comfort and readability; in the end, once compiled, it gets converted into calls to standard query operators. You could decide to write all your queries only with query operators and avoid the query expression syntax if you prefer.

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The View tab of the Folder Options dialog box, shown in Figure 16-11, offers a potpourri of advanced options that govern various aspects of Windows Explorer s behavior. Some of these are self-explanatory and relatively inconsequential. Others are less obvious and can have a significant impact on how you work in Windows XP. The following sections provide brief descriptions of these options.

Throughout this book, we ll write queries either using the query operators directly or using query expressions. Even when using query expressions, we may have to explicitly use some of the query operators. Only a subset of the standard query operators is supported by the query expression syntax and keywords. It s often necessary to work with some of the query operators right in the context of a query expression. The C# compiler translates query expressions into invocations of the following operators: Where, Select, SelectMany, Join, GroupJoin, OrderBy, OrderByDescending, ThenBy, ThenByDescending, GroupBy, and Cast, as shown in table 3.2. If you need to use other operators, you can do so in the context of a query expression. For example, in listing 3.7, we use the Take and Distinct operators.

1. In which Event Viewer log can you find Group Policy failure and warning mes sages What type of event log records should you look for

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You can find Group Policy failure and warning messages in the application event log. Event log records with the Userenv source pertain to Group Policy events.

Figure 16-11.

2. What diagnostic log file can you generate to record detailed information about Group Policy processing and in what location is this file generated

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C# query expression that uses query operators (QueryExpressionWithOperators.csproj)

You can generate a diagnostic log to record detailed information about Group Policy processing to a log file named Userenv.log in the hidden folder %Systemroot%\Debug\Usermode.

By default, Windows scans your network periodically for newly shared printers and folders, adding those that it finds to My Network Places and your Printers And Faxes folder. You might want to clear this check box if you re disconnected from the network most of your day. Otherwise, leave it selected; it s a convenience you might as well enjoy.

3. Which of the following actions should you take if you attempt to open a Group Policy Object Editor console for an OU GPO and you receive the message Failed To Open The Group Policy Object a. Check your permissions for the GPO. b. Check network connectivity. c. Check that the OU exists. d. Check that No Override is set for the GPO. e. Check that Block Policy Inheritance is set for the GPO.

If you pause your mouse pointer over a folder icon, Windows Explorer normally displays a folder tip that describes the contents of the folder and tells you how much space the folder s contents consume.

The correct answer is b. The message Failed To Open The Group Policy Object indicates a networking problem, specifically a problem with the Domain Name System (DNS) configuration.

var authors = from distinctAuthor in ( from book in SampleData.Books where book.Title.Contains("LINQ") from author in book.Authors.Take(1) select author) .Distinct() select new {distinctAuthor.FirstName, distinctAuthor.LastName};

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4. Which of the following actions should you take if you attempt to edit a GPO and you receive the message Missing Active Directory Container a. Check your permissions for the GPO. b. Check network connectivity. c. Check that the OU exists. d. Check that No Override is set for the GPO. e. Check that Block Policy Inheritance is set for the GPO.

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