Windows form fullscreen

Make this is as separate FullScreen.cs file

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

namespace FullScreenMode
{
public class FullScreen
{
private Form _Form;
private FormWindowState _cWindowState;
private FormBorderStyle _cBorderStyle;
private Rectangle _cBounds;
private bool _FullScreen;

public FullScreen(Form form)
{
_Form = form;
_FullScreen = false;
}

private void ScreenMode()
{

// set full screen
if (!_FullScreen)
{
// Get the WinForm properties
_cBorderStyle = _Form.FormBorderStyle;
_cBounds = _Form.Bounds;
_cWindowState = _Form.WindowState;

// set to false to avoid site effect
_Form.Visible = false;

HandleTaskBar.hideTaskBar();

// set new properties
_Form.FormBorderStyle = FormBorderStyle.None;
_Form.WindowState = FormWindowState.Maximized;

_Form.Visible = true;
_FullScreen = true;
}
else // reset full screen
{
// reset the normal WinForm properties
// always set WinForm.Visible to false to avoid site effect
_Form.Visible = false;
_Form.WindowState = _cWindowState;
_Form.FormBorderStyle = _cBorderStyle;
_Form.Bounds = _cBounds;

HandleTaskBar.showTaskBar();

_Form.Visible = true;

// Not in full screen mode
_FullScreen = false;
}
}

public void ShowFullScreen()
{
ScreenMode();
}

public void ResetTaskBar()
{
HandleTaskBar.showTaskBar();
}
}
}

Use like Follow

from the form load or button click event call like

FullScreen fullScreen = new FullScreen(this);
fullScreen.ShowFullScreen();