Comments by John Smith 27 (Top 26 by date)

This prevents the formMains's KeyDown from firing the arrows down:

private void buttonRestart_Enter(object sender, EventArgs e)
{
ActiveControl = label1;
}

even when label1.Visible = true;

Accepted but plz change the arguments like the ones I made in my answer, the ones in your answer don't work, these work:

PostMessage(
new HandleRef(null, new IntPtr((int)SpecialHandles.HWND_BROADCAST)),
WM_SYSCOMMAND,
new IntPtr( SC_SCREENSAVE),
new IntPtr( 0));

The one with TurnOnScreenSaver();

I changed it to work correctly, duplicate my answer of your code and I will accept it plz, thx a lot.

I get an error that can't convert "null" to HandleRef.

[DllImport("User32.dll")]
public static extern int SendMessage (IntPtr hWnd, uint Msg, uint wParam, uint lParam);

[DllImport("User32.dll")]
static extern bool PostMessage(HandleRef hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

The arguments you provided for PostMessage aren't correct, please provide correct arguments for this:

[DllImport("user32.dll")]
static extern bool PostMessage(HandleRef hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

See the code in the new answer I submitted plz.

I have 2 programs, 2 Visual Studio solutions each in a separate File Explorer folder, one I made and one entirely from your code, but the exe that is entirely from your code keeps open after it has finished its job there's still an open thread in it that keeps running in the background in Windows after I log in to Windows and it should exit and not keep running in the background eating up RAM from the computer without doing a job as it has ran the screensaver and locked the screen and when I log in Windows it should exit.

In Visual Studio, when I run the app it shows the screensaver, and when I exit the screensaver and log into Windows, I still see the program open as it doesn't exit when it finished its job, it keeps showing me that it's running and its RAM usage statistics while it's still running instead of having exited after I logged in to Windows and the exe's job is finished.

It works but it keeps open in the system even after the screen is unlocked.

The first should be a HandleRef.

And what would be its parameters that to be sent then?

[DllImport("user32.dll")]
static extern bool PostMessage(HandleRef hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

But the application keeps running and doesn't exit after login, how to fix that?

Actually it works like magic I'm sorry I didn't understand it first, submit as an answer plz.

It didn't help, sorry.

https://prnt.sc/bko6iQlP_B-j this doesn't make my form pass mouse clicks to what's behind it, I made the image stay for 1 second (the form) and when I click on it the click doesn't pass through... maybe I need to do the same for the picturebox? EDIT: I tested without the picturebox covering and the click still doesn't pass through.

How can I make it click-throughable while it's not transparent and is showing an image on top of other windows plz?

But why is that? I'm using the ID numbers for these events I found in Google, would you please have a look at them? (please see the simplified question)

They are not, and there are many numbers of events and no names like: "Session locked" or "Session unlocked", there's "User account management" which has a lot of it and no fine explanation in its window, I cannot figure out the numbers and the numbers I find in Google don't work for me, Windows 10 - 64bit - 21H2. I'm looking in Security in Event Viewer.

Thx, see the updated question please.