Microsoft.Win32 (system.dll)delegate

This delegate defines the signature that an event handler must use to receive the SystemEvents.PowerModeChanged event. This event is raised when the computer enters or exits suspend mode, and when the power consumption level changes. A computer requires Advanced Power Management (APM) or Advanced Configuration and Power Interface (ACPI) support in order to use these operating system features. APM/ACPI is usually supported on (but not restricted to) portable computers and devices.

public delegate void PowerModeChangedEventHandler(object sender, PowerModeChangedEventArgs e);

Associated Events

SystemEvents.PowerModeChanged( )

    Part II: Programming with the .NET Framework
    Part IV: API Quick Reference
    Chapter 26. System