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Here, ReadAllLines executes immediately and loads the complete file in memory, before any iteration happens Of course, this consumes a lot of memory, but in addition, we load the complete file while we may not process it completely LINQ to Objects has been designed to make the most of deferred query execution The streaming approach it uses also saves resources, like memory and CPU It s important to walk down the same path whenever possible There are several ways to read text from a file using the NET Framework FileReadAllLines is simply one A better solution for our example is to use a streaming approach for loading the file This can be done with a StreamReader object It will allow us to save resources and give us a smoother execution.

3 Type the user name and password for the account that you want to be logged on to each time you start your computer.

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After you make this change, you can use other accounts on the computer by logging off and then logging on to another account or by using Fast User Switching.

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Fast User Switching, a feature that made its first appearance in Windows XP, allows multiple users to be logged on to a computer at the same time. As the feature name suggests, you can quickly switch among users. This might be convenient, for example, if one user logs on, opens several documents, and begins downloading a huge file from the Internet. Meanwhile, another user comes along and wants to quickly check e-mail. With Fast User Switching enabled, it s no problem. The second user can log on, log off, and return control to the first user. While the second user is logged on, the first user s applications (such as the download process) continue to run. To switch to another user account, press the Windows logo key+L. This displays the Welcome screen, from which the second user can click his or her name and enter a password, if required. Tip If your keyboard doesn t have a Windows logo key (or you prefer using the mouse), you can get to the Welcome screen by clicking Start, Log Off. In the Log Off Windows dialog box, click Switch User. Fast User Switching won t work in every situation. To enable the feature you must observe the following requirements:

6. In the Add Counters dialog box, select one of the following:

In order to integrate the StreamReader in the query, an elegant solution is to create a custom query operator, as Eric White suggests in his example5 See Listing 528..

The Welcome screen must be enabled. The computer must not be joined to a domain. Offline files must be disabled.

To monitor the computer on which System Monitor is running, click Use Local Computer Counters. To monitor a specific computer, regardless of where System Monitor is run ning, click Select Counters From Computer, and select in the text box the UNC name of the computer you want to monitor (the name of the local com puter is selected by default). Or, you can type the IP address of the computer you want to monitor.

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When creating a Performance Logs And Alerts snap-in for export, make sure to select Use Local Computer Counters. Otherwise, counter logs obtain data from the computer named in the text box, regardless of where the snap-in is installed.

A very efficient use of paper, with about 5 percent of the image cropped; the cuts are made equally on the long edges of the image.

7. In the Performance Object list, select NTDS. 8. To select the counters to monitor, choose one of the following options:

public static class StreamReaderEnumerable { public static IEnumerable<String> Lines(this StreamReader source) {

Cropping removes more than 10 percent of the image, and the effect can be especially severe because the cuts are to the long edges in other words, an image that is shot in landscape orientation loses equally large slices from the top and bottom. For most efficient use of paper, choose the layout with three photos per 8 11 inch sheet. This option makes the most efficient use of paper, with less intrusive cropping than the 4 6 layout.

To monitor all counters for the NTDS performance object, click All Counters. To monitor only selected counters, click Select Counters From List, and select the counters you want to monitor from the list. You can select multiple counters by clicking on a counter and holding the Ctrl key.

This layout involves virtually no cropping. If you don t need nine copies of a single image, try selecting three images and printing each picture three times.

Note Because there are many counters, monitoring all counters affects processing time and is not a practical solution.

String line; if (source == null) throw new ArgumentNullException("source"); while ((line = source.ReadLine()) != null) yield return line; } }