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to do things in new, simpler, more concise ways. The usual trade-off to get these benefits is performance. LINQ is no exception. The goal of this section is to make sure you know the performance implications of LINQ queries. We ll show you how to get an idea of LINQ s overhead and provide some figures. We ll also highlight the main pitfalls. If you know where they are, you ll be in a better position to avoid them. As always, we have several ways to perform one task with the .NET Framework. Sometimes, the choice is only a matter of taste, other times it s a matter of conciseness, but more often than not, making the right choice is critical and impacts the behavior of your program. Some methods are well adapted for LINQ queries and others should be avoided. In this section, we ll test the performance of several ways to use LINQ. We ll also compare code written with LINQ and code written without LINQ. The goal is

Similar to the full page layouts, with slightly more severe cropping. This layout removes about 6 percent (cropped equally from the short edges of the image) of a standard 4 :3 photo.

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If your computer has only one account (aside from Administrator and Guest), and if that account doesn t have a password, Windows XP automatically logs on as that user during startup. You won t see the Welcome screen or any other logon screens; Windows launches straight to your desktop. You might want to set up your computer to log on this way even if it has more than one user account. This kind of logon can be convenient in several situations: if you re the primary user of the computer but other people occasionally need to use it; if you occasionally need to log 223

Off the Record Most new hard disk controllers support simultaneous file I/O to multiple hard disks. If you have multiple physical hard disks available on an Active Directory domain contoller, you should place the Active Directory database on a separate physical hard disk than the operating system files. Doing so improves the performance of Active Directory. Fur ther, separating the Active Directory log files from the Active Directory database increases performance. You can do this with Ntdsutil, as you ll see in the Troubleshooting Lab in this chapter.

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to compare the benefits for the developer in terms of productivity and code readability between the various options. We ll make sure you understand the impact of each option in terms of performance. To get started, we ll get back to our LINQ to Text Files example one more time. It will be useful to demonstrate how it s important to choose the right methods for reading text from a file in LINQ queries.

Active Directory nonsystem data providers include those for Net Logon, Kerberos, and SAM. These providers generate trace log files containing messages that can be used to track the operations performed. A parsing tool is required to interpret the trace log output. Developers can create such a tool using APIs provided on the Microsoft Web site (http://msdn.microsoft.com/).

Microsoft Windows XP Inside Out, Second Edition on as a different user to install software or perform other tasks; or if you have set up a password for your account (so that you could use scheduled tasks or connect remotely, operations that are available only to accounts with passwords), but you still want it to log you on automatically at startup. Note Automatically logging on means that the system effectively enters your user name and password when you turn on the power. Anyone who has physical access to your computer can then log on as you and have access to all computer resources (including Web sites for which you ve saved passwords) that you normally have. Tip Bypass automatic logon or prevent others from bypassing If you ve configured your system to log on automatically, you can suppress the automatic logon by holding down the left Shift key as the system boots. If you want to prevent users from bypassing the automatic logon (thereby ensuring that your system always starts with a particular account), you can use a registry setting to make the system ignore the Shift key. Use Registry Editor to navigate to HKLM\Software\Microsoft\ WindowsNT\CurrentVersion\Winlogon. If the string value IgnoreShiftOverride doesn t exist, create it. Set this value to 1 to ensure that your system always starts with its auto-logon account. You can set up your computer to log on automatically by following these steps: