Form Stays On Top

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp7
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (button1.Text == "False")
            {
                this.TopMost = true;
                button1.Text = "True";
            }
            else
            if (button1.Text == "True")
            {
                this.TopMost = false;
                button1.Text = "False";
            }
        }

        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
            if (checkBox1.Checked)
            {
                if (checkBox1.Text == "False")
                {
                    this.TopMost = true;
                    checkBox1.Text = "True";
                }
            }
            else
            {
                this.TopMost = false;
                checkBox1.Text = "False";
            }
        }
    }
}