How Can I Make a WinForms App Truly Full-Screen and Hide the Taskbar?

WinForms application displays full screen and hides taskbar

For a WinForms application to achieve a true full-screen experience, not only the standard window borders need to be hidden, but also the taskbar needs to be hidden.

Hide taskbar

To hide the taskbar:

1. In the form's Load event, set this.TopMost to true.
2. Then, set this.FormBorderStyle to FormBorderStyle.None.
3. Finally, set this.WindowState to FormWindowState.Maximized.

private void Form1_Load(object sender, EventArgs e)
{
    this.TopMost = true;
    this.FormBorderStyle = FormBorderStyle.None;
    this.WindowState = FormWindowState.Maximized;
}

Auto-hide menu bar

To automatically hide the menu bar:

1. Set the menu bar's AutoSize property to true.
2. Sets the Dock attribute to DockStyle.Top.
3. Then, handle the MenuStrip_MouseLeave event and set the Visible attribute to false.

private void MenuStrip_MouseLeave(object sender, EventArgs e)
{
    this.MenuStrip.Visible = false;
}

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