C#のFormアプリでマルチモニタそれぞれに全画面表示する

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

namespace DualMonitor
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            const int MONITOR1 = 0;
            const int MONITOR2 = 1;

            if(Screen.AllScreens.Length < 2)
            {
                Console.WriteLine("Not Multi Monitors!");
            }
            else
            {
                Screen Screen1 = Screen.AllScreens[MONITOR1];
                Screen Screen2 = Screen.AllScreens[MONITOR2];

                var form2 = new Form2();
                form2.BackColor = Color.Red;
                form2.StartPosition = FormStartPosition.Manual;
                form2.WindowState = FormWindowState.Normal;
                form2.Location = Screen1.Bounds.Location;
                form2.FormBorderStyle = FormBorderStyle.None;
                form2.WindowState = FormWindowState.Maximized;
                form2.Show();

                var form3 = new Form3();
                form3.BackColor = Color.Blue;
                form3.StartPosition = FormStartPosition.Manual;
                form3.WindowState = FormWindowState.Normal;
                form3.Location = Screen2.Bounds.Location;
                form3.FormBorderStyle = FormBorderStyle.None;
                form3.WindowState = FormWindowState.Maximized;
                form3.Show();
            }
        }

        private void Form1_Activated(object sender, EventArgs e)
        {
            this.Hide();
        }
    }
}