my C# winform needs to detect when other applications enter/exit/run-in TRUE fullscreen, prefer by events
my C# winform needs to detect when other applications enter/exit/run-in TRUE fullscreen, prefer by events windows
windows
According to this question "full screen mode" is not that special, just create the right type of window and the OS will treat it as full screen. Once you know that, you can see here how to detect such windows.