How do I make a WinForms app go Full Screen

Question

I have a WinForms app that I am trying to make full screen (somewhat like what VS does in full screen mode).

Currently I am setting FormBorderStyle to <

Answer 1

I don't know if it will work on .NET 2.0, but it worked me on .NET 4.5.2. Here is the code:

using System;
using System.Drawing;
using System.Windows.Forms;

public partial class Your_Form_Name : Form
{
    public Your_Form_Name()
    {
        InitializeComponent();
    }

    // CODE STARTS HERE

    private System.Drawing.Size oldsize = new System.Drawing.Size(300, 300);
    private System.Drawing.Point oldlocation = new System.Drawing.Point(0, 0);
    private System.Windows.Forms.FormWindowState oldstate = System.Windows.Forms.FormWindowState.Normal;
    private System.Windows.Forms.FormBorderStyle oldstyle = System.Windows.Forms.FormBorderStyle.Sizable;
    private bool fullscreen = false;
    /// 

    /// Goes to fullscreen or the old state.
    /// 
    private void UpgradeFullscreen()
    {
        if (!fullscreen)
        {
            oldsize = this.Size;
            oldstate = this.WindowState;
            oldstyle = this.FormBorderStyle;
            oldlocation = this.Location;
            this.WindowState = System.Windows.Forms.FormWindowState.Normal;
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
            this.Bounds = System.Windows.Forms.Screen.PrimaryScreen.Bounds;
            fullscreen = true;
        }
        else
        {
            this.Location = oldlocation;
            this.WindowState = oldstate;
            this.FormBorderStyle = oldstyle;
            this.Size = oldsize;
            fullscreen = false;
        }
    }

    // CODE ENDS HERE
}

Usage:

UpgradeFullscreen(); // Goes to fullscreen
UpgradeFullscreen(); // Goes back to normal state
// You don't need arguments.

Notice: You MUST place it inside your Form's class (Example: partial class Form1 : Form { /* Code goes here */ } ) or it will not work because if you don't place it on any form, code this will create an exception.