[DllImport("Kernel32")]
public static extern bool SetConsoleCtrlHandler(HandlerRoutine Handler, bool Add);

public delegate bool HandlerRoutine(CtrlTypes CtrlType);

public enum CtrlTypes 
{
    CTRL_C_EVENT = 0,
    CTRL_BREAK_EVENT,
    CTRL_CLOSE_EVENT, 
    CTRL_LOGOFF_EVENT = 5,
    CTRL_SHUTDOWN_EVENT
}