How to find hostname of a computer using c#

How to find hostname of a computer

using System;

using System.Net;

using System.Windows.Forms;

namespace WindowsApplication1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            MessageBox.Show (Dns.GetHostName());

        }

    }

}