Uploaded February 2018 | Updated September 2026, 1 week ago

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Steps to detect when PC goes to sleep and wakes up in VB.NET.

.Net Framework 4.6.1
Windows Forms App
Visual Studio Community
Windows 10

#vbdotnet
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Imports Microsoft.Win32


Public Class Form1
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

AddHandler SystemEvents.PowerModeChanged, AddressOf SystemEvents_PowerModeChanged

End Sub


Private Sub SystemEvents_PowerModeChanged(ByVal sender As Object, ByVal e As PowerModeChangedEventArgs)

Select Case e.Mode

Case PowerModes.Suspend
txtSuspend.Text = Now

Case PowerModes.Resume
txtResume.Text = Now

End Select

End Sub
End Class