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Note If you need to delete an external trust in a domain using Windows 2000 mixed functionality, the trust should always be deleted from a domain controller running Windows Server 2003. External trusts to Windows NT 4 or 3.51 domains can be deleted by authorized administrators on the Windows NT 4 or 3.51 domain controllers. However, only the trusted side of the relationship can be deleted on Windows NT 4 or 3.51 domain controllers. The trusting side of the relationship (created in the Windows Server 2003 domain) is not deleted, and although it will not be operational, the trust will continue to display in the Active Directory Domains And Trusts console. To remove the trust completely, you delete the trust from a domain controller running Windows Server 2003 in the trusting domain. If an external trust is inadvertently deleted from a Windows NT 4 or 3.51 domain controller, you must recreate the trust from any domain controller running Windows Server 2003 in the trusting domain.

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As you can see, many operators are predefined. For reference, you can find this list augmented with a description of each operator in the appendix. You ll also learn more about the standard query operators in chapter 4, where we ll provide several examples using them. We ll then demonstrate how they can be used to do projections, aggregation, sorting, or grouping. Thanks to the fact that query operators are mainly extension methods working with IEnumerable<T> objects, you can easily create your own query operators. We ll see how to create and use domain-specific query operators in chapter 12, which covers extensibility.

Note It is not possible to remove the default two-way transitive trusts between domains in a forest. Only explicitly created trusts can be deleted.

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Another key concept of LINQ is a new language extension. C# and VB.NET propose syntactic sugar for writing simpler query code in most cases. Until now, in this chapter, we ve used a syntax based on method calls for our code samples. This is one way to express queries. But most of the time when you look at code based on LINQ, you ll notice a different syntax: query expressions. We ll explain what query expressions are and then describe the relationship between query expressions and query operators.

To configure the places bar with Tweak UI, start Tweak UI (if you use the default setup, you ll find an icon for it in the Start, All Programs, Powertoys For Windows XP folder) and select Common Dialogs\Places Bar in the left pane. As shown in Figure 16-5, you can use any of the valid entries permitted by Group Policy (listed in the preceding section) or you can select from a short list of common places.

work on sensitive data that requires special handling. She is especially worried about that data being backed up and secured. All client computers have P: drive mappings that are supposed to be used for storing files. However, many employees don t really understand drive mappings. They often store files in their My Documents folder and then copy them over to the P: drive. This is also an issue because many employees forget to copy their files to the server until something (such as a data loss) occurs. Given the concerns of Lucerne Publishing as outlined above, answer the following questions: 1. How would you address Linda s concern that some employees don t understand drive mappings and others forget to store their data on the server

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3. How would you address the users with mobile computers so that they could work on their files while traveling

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4. Linda warns that some users may have huge amounts of data already stored in their My Documents folder on their local system. How might this affect your rec ommendations

Query operators are static methods that allow the expression of queries. But instead of using the following syntax

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Figure 16-5. Microsoft s Tweak UI program lets you modify the places bar in the common Open and Save dialog boxes.

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