how to ping Continuously

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C#

ASP.NET

networking

hi everyone ..
im creating application to check connection Status but my problem i must click button to get result so how it is possible to get replay or Continuously from that ping ,,
this is my code

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;
using System.Threading;
using System.Net.NetworkInformation;

namespace ping_test_2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Ping p = new Ping();
            PingReply r;
            string s;
            s = textBox1.Text;
            r = p.Send(s);
            if (r.Status == IPStatus.Success)
            {
              listBox1.Items.Add( "Ping to " + s.ToString() + r.Address.ToString() + "]" + " Successful"
               + " Response delay = " + r.RoundtripTime.ToString() + " ms" + "\n");
              button2.BackColor = Color.Green;
            }
            else if (r.Status == IPStatus.TimedOut)
            {
                button2.BackColor = Color.Red;
            }
        }
    }
}

can anyone of you help me with this plz