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Решение ниже использует API Win32. OnSessionLock называют, когда рабочая станция заблокирована, и OnSessionUnlock называют, когда это разблокировано.

[DllImport("wtsapi32.dll")]
private static extern bool WTSRegisterSessionNotification(IntPtr hWnd,
int dwFlags);

[DllImport("wtsapi32.dll")]
private static extern bool WTSUnRegisterSessionNotification(IntPtr
hWnd);

private const int NotifyForThisSession = 0; // This session only

private const int SessionChangeMessage = 0x02B1;
private const int SessionLockParam = 0x7;
private const int SessionUnlockParam = 0x8;

protected override void WndProc(ref Message m)
{
    // check for session change notifications
    if (m.Msg == SessionChangeMessage)
    {
        if (m.WParam.ToInt32() == SessionLockParam)
            OnSessionLock(); // Do something when locked
        else if (m.WParam.ToInt32() == SessionUnlockParam)
            OnSessionUnlock(); // Do something when unlocked
    }

    base.WndProc(ref m);
    return;
}

void OnSessionLock() 
{
    Debug.WriteLine("Locked...");
}

void OnSessionUnlock() 
{
    Debug.WriteLine("Unlocked...");
}

private void Form1Load(object sender, EventArgs e)
{
    WTSRegisterSessionNotification(this.Handle, NotifyForThisSession);
}

// and then when we are done, we should unregister for the notification
//  WTSUnRegisterSessionNotification(this.Handle);