Hello All, I am working On an Windows application which require to exit only from within it self and Not from any other External source.. it means user can not stop or kill the application Process by Task Manager. and if he wish to close the application there is only option to close from whithin application. does Any one have a Idea how to so this??

yes

When the press of a button Alt + Ctrl + Delete and terminate the Service

How to prevent the user to stop the service?

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how prevention be possible user from stopping service?