Remove CLOSE Button using C#

Remove CLOSE Button using C#

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace WindowsFormsApplication1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

            this.ControlBox = false;

        }

        private void button1_Click(object sender, EventArgs e)

        {

            this.Close();

        }

    }

}