InstallUtil PerformanceCounterDemo.exe in .NET framework

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InstallUtil PerformanceCounterDemo.exe
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Part IV:
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Win32 Applications
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This command installs all the performance counters you ve defined, and you can see them in the Performance system tool. Likewise, you can uninstall these counters simply by running InstallUtil with the /U option:
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InstallUtil /U PerformanceCounterDemo.exe
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The installation procedure is a transaction, in that if any of the action performed during the installation fails for any reason, all the actions already undertaken are rolled back in an orderly fashion.
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Figure 19-6 A PerformanceCounter component exposes an Add Installer option in the Properties window.
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The EventLog Component
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The .NET Framework gives you the classes to read and write from one of the event logs installed on a local or remote machine, and even to create new logs. This feature overcomes one of the limitations of Visual Basic 6 and offers a standard way for appli cations to record the success or failure of key operations.
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Introduction to Event Logging
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When something relevant happens in an application particularly in applications that don t have a user interface, such as components, ASP.NET server applications, and Win dows services your code should record an event in one of the system logs so that the user or the administrator can check whether something went wrong. For example, an application might write to the event log when it can t start correctly, when it can t com plete a critical operation, or when a low-memory situation is degrading performance.
19:
Advanced Win32 Techniques
Event logs are available only on Windows NT, Windows 2000, Windows XP, and Win dows 2003 Server machines. By default, three event logs are available: the System log (which records events occurring on system components, such as drivers), the Security log (which records security changes and attempted violations of security permissions), and the Application log (which records events coming from registered applications). Applications can create their own logs, as is the case with the Active Directory and the DNS Server programs, but in most cases they write their events to the Application log. Five different types of events are available:
Information A significant successful operation for example, when a service starts or when a complex backup operation completes. This is the default type if you don t specify otherwise. Warning A problem has occurred, but the application can recover from it without having to shut down. A typical warning records a low-resource situation, which might cause later problems, such as loss of performance. Error A significant problem has occurred, such as loss of data or functionality; for example, Windows writes an error event when it can t load a service. Success audit A security event that occurs when an access attempt is successful, such as when a user successfully logs on to the machine. Failure audit A security event that occurs when an access attempt fails, such as when a user can t log on or when a file can t be opened because the user has insufficient security permissions.
The main tool for browsing the current state of all event logs is the Event Viewer, a Microsoft Management Console (MMC) snap-in that s installed with the operating sys tem. (See Figure 19-7.) In most cases, you want to filter events by their source that is, the program that wrote them. You can achieve this filtering by using the Filter com mand in the View menu.
Figure 19-7
The Event Viewer MMC snap-in
Part IV:
Win32 Applications
You also can manage the event logs from the Visual Studio .NET Server Explorer win dow, which lets you browse existing entries grouped by their source application, as you can see in Figure 19-8.
Figure 19-8
The Server Explorer window in Visual Studio .NET
Reading Event Log Entries
You can read event log entries by defining a System.Diagnostics.EventLog object that points to a specific event log for example, the Application log or the System log. You can create such an object in three ways: by dragging an element from the Server Explorer window to the form s component tray area, by dragging an item from the Component tab of the Toolbox to a form or component s tray area, or entirely through code. In this section, I ll focus on the last method, which also works from inside classes and modules, but the concepts apply to the other two cases as well.
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