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Responding to System Events Sample 

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

Security noteSecurity Note

This sample code is provided to illustrate a concept and should not be used in applications or Web sites, as it may not illustrate the safest coding practices. Microsoft assumes no liability for incidental or consequential damages should the sample code be used for purposes other than as intended.

To open the sample file in Solution Explorer

  1. Click Download Sample.

    The File Download message box appears.

  2. Click Open, and on the left column of the zip folder window, click Extract all files.

    The Extraction Wizard opens.

  3. Click Next. You can change the directory that the files will be extracted to, and then click Next again.

  4. Make sure that the Show extracted files check box is selected, and click Finish.

  5. Double-click the sample's .sln file.

    The sample solution is displayed in Solution Explorer. You might get a security warning that says the solution location is not trusted. Click OK to continue.

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



Change the screen resolution.



Modify the current system time.

Power mode


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

User preference


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

Installed fonts


Install or delete a font.

See Also