C# Turn off selected monitor

Question

I'm wondering if someone could help me I have been trying to find a way of turning off specific monitors in a basic application, there are a couple of posts on here about turning off all monitors and this works fine. The only topic I can see if this one here: C# selectively turn off monitor

This does explain how to go about doing this but I'm still learning and not really sure how to expand the example into whats needed.

Turn off all monitors:

public void MonitorOff(IntPtr handle)
    {
        SendMessage(handle, WmSyscommand, (IntPtr)ScMonitorpower, (IntPtr)MonitorShutoff);
    }

 private void MonitorOn()
    {
        mouse_event(MouseeventfMove, 0, 1, 0, UIntPtr.Zero);
        Thread.Sleep(40);
        mouse_event(MouseeventfMove, 0, -1, 0, UIntPtr.Zero);
    }


[DllImport("user32.dll")]
    static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);
    [DllImport("user32.dll")]
    static extern void mouse_event(Int32 dwFlags, Int32 dx, Int32 dy, Int32 dwData, UIntPtr dwExtraInfo);

    private const int WmSyscommand = 0x0112;
    private const int ScMonitorpower = 0xF170;
    private const int MonitorShutoff = 2;
    private const int MouseeventfMove = 0x0001;

    [DllImport("user32")]
    private static extern bool EnumDisplayMonitors(IntPtr hdc, IntPtr lpRect, MonitorEnumProc callback, int dwData);

    private delegate bool MonitorEnumProc(IntPtr hDesktop, IntPtr hdc, ref Rect pRect, int dwData);

    [StructLayout(LayoutKind.Sequential)]
    private struct Rect
    {
        public int left;
        public int top;
        public int right;
        public int bottom;
    }

Count Monitors:

public void GetMonitors()
    {

        int monCount = 0;
        //Rect r = new Rect();
        MonitorEnumProc callback = (IntPtr hDesktop, IntPtr hdc, ref Rect prect, int d) => ++monCount > 0;

        if (EnumDisplayMonitors(IntPtr.Zero, IntPtr.Zero, callback, 0))
           MessageBox.Show("You have " + monCount.ToString() + " monitors", "Windows Hook");
        else
           MessageBox.Show("An error occured while enumerating monitors");

    }

Is anyone able to enplane this or show me the right route to take?, Thank you.