UWP TypedEventHandler, where to code?

Hello,
on page
https://docs.microsoft.com/en-us/uwp/api/windows.ui.core.corewindow#Windows_UI_Core_CoreWindow_Activated

is an example
public : event TypedEventHandler Activated

where should I code it and how write the code to react on this event?

Thank you for tips
Erhy
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