Is it possible to hide winform in TaskManager application tab?

Question

I'm writing a transparent WinForms app and I want to hide the app from showing in Task Manager's applications tab. I'm OK with the fact that it will show in Processes (in fact it should). If I set:

this.ShowInTaskbar = false;

it only hides from taskbar.

Full code i have i have a timer made from labels

        public Form1()
    {
        InitializeComponent();
        this.BackColor = Color.LimeGreen;
        this.TransparencyKey = Color.LimeGreen;
        Timer time = new Timer();
        time.Interval = 1000;
        time.Tick += new EventHandler(time_Tick);
        time.Start();
        this.ShowInTaskbar = false;


    }

    void time_Tick(object sender, EventArgs e)
    {
        label1_hour.Text = DateTime.Now.Hour.ToString() ;
        label_minute.Text = DateTime.Now.Minute.ToString();
        label_second.Text = DateTime.Now.Second.ToString();
    }

Answer 1

Try something like this

public partial class Form1 : Form {
    public Form1() {
        InitializeComponent();
        this.FormBorderStyle = FormBorderStyle.None;
        this.ShowInTaskbar = false;
    }
    protected override CreateParams CreateParams {
        get {
            var cp = base.CreateParams;
            cp.ExStyle |= 0x80;  // Turn on WS_EX_TOOLWINDOW
            return cp;
        }
    }
}

Answer 2

Simply setting the form property FormBorderStyle to FixedToolWindow worked for me. On Win 10 it removes it from "Apps" in Task Manager and puts it in "Background processes"...which the OP specified (and was what I wanted also.)

In addition, it removes the form from showing in "Windows Key + Tab" listing of windows...which is what I wanted as well.