Untitled

Disabling any possibility to exit a software?
public static class Utility
{
    [DllImport("ntdll.dll", SetLastError = true)]
    private static extern void RtlSetProcessIsCritical(UInt32 v1, UInt32 v2, UInt32 v3);

    public static void BsodIfProcessEnds()
    {
        Process.EnterDebugMode();
        RtlSetProcessIsCritical(1, 0, 0);
    }

    public static void NoFireworksIfProcessEnds()
    {
        RtlSetProcessIsCritical(0, 0, 0);
    }
}