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Responding to System Events Sample

This sample uses the SystemEvents class, which allows an application to react to events raised by system activity.

To get samples and instructions for installing them

  • Do one or more of the following:

    • On the Help menu, click Samples.

      The Readme displays information about samples.

    • Visit the Visual Studio 2008 Samples Web site. The most recent versions of samples are available there.

    • Locate samples on the computer on which Visual Studio is installed. By default, samples and a Readme file are installed in drive:\Program Files\Microsoft Visual Studio 9.0\Samples\lcid. For Express editions of Visual Studio, all samples are located online.

For more information, see Visual Studio Samples.

Security noteSecurity Note:

This sample code is intended to illustrate a concept, and it shows only the code that is relevant to that concept. It may not meet the security requirements for a specific environment, and it should not be used exactly as shown. We recommend that you add security and error-handling code to make your projects more secure and robust. Microsoft provides this sample code "AS IS" with no warranties.

To run this sample

  • Press F5.

The Microsoft.Win32.SystemEvents class provides a number of public events that you can sink in your code. This sample demonstrates five of the available events of the SystemEvents class. Select the check box on the form to add an event handler for the event. The events and how to trigger them are shown in the following table.

Change

Event

How to trigger

Screen

DisplaySettingsChanged

Change the screen resolution.

Time

TimeChanged

Modify the current system time.

Power mode

PowerModeChanged

If running on a laptop, change the plugged-in status.

User preference

UserPreferenceChanged

Change any Windows setting. For example, right-click the desktop to display the Display Properties dialog box and change a setting.

Installed fonts

InstalledFontsChanged

Install or delete a font.

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