How Can I Make a WinForms App Full Screen, Including the Taskbar?

Creating a Full-Screen WinForms Application

This guide demonstrates how to design a WinForms application that expands to encompass the entire screen, including the taskbar. We'll also show you how to automatically hide the menu strip for optimal screen usage.

Modifying Form Properties

To achieve full-screen display, adjust the form's properties. Set FormBorderStyle to None and WindowState to Maximized. This maximizes the form, but the taskbar remains visible.

To conceal the taskbar, set the TopMost property to true. This positions the form above all other windows, including the taskbar.

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

Automatic Menu Strip Hiding

For enhanced screen space, automatically hide the menu strip when the form is maximized. This is accomplished by setting the menu strip's Visible property to false in the maximized state.

private void Form1_Resize(object sender, EventArgs e)
{
    this.menuStrip1.Visible = this.WindowState != FormWindowState.Maximized;
}

Important Note: The sequence of property settings is crucial. Setting WindowState to Maximized before TopMost to true will leave the taskbar visible. Ensure you set TopMost first.

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