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I have a C# winform .Net 4.0 application in Windows 7. The application hosts COM control. When user unlocks the machine with application open, the COM control is not refreshed and that section of form is shown as black. To resolve this issue , I handled system unlock event and did an explicit refresh and the issue is resolved. If user presses alt + ctrl + del combination and then press esc key , system unlock event is not fired. So the issue happens in this case. I can handle esc key in the application. But how will find out whether alt + ctrl + del combination is pressed before esc key?

Camilo Martinez
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user2315055
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    duplicate question: http://stackoverflow.com/questions/1292165/how-to-trap-the-keyboard-strokes-on-a-c-sharp-win-forms-application-ctrl-alt – danywalls Apr 24 '13 at 10:26
  • By "pushes the Esc key" do you mean that the user presses Esc to cancel the unlock sequence, i.e. does not enter a password but just puts the machine back to the screen saver instead of unlocking? I doubt that's possible to catch at all. – nielsm Apr 24 '13 at 10:26
  • In my machine , if i press alt + ctrl + del combination from desktop , i get screen with options like 'LOCK COMPUTER' , Switch User,Log Off etc. If I press esc key , it goes back to desktop screen . – user2315055 Apr 24 '13 at 10:39

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