Display MAC Address

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Net.NetworkInformation;

public partial class _Default : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

    }

    protected void Button1_Click(object sender, EventArgs e)

    {

        NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();

        String sMacAddress = string.Empty;

      

           foreach (NetworkInterface adapter in nics)

        {

            if (sMacAddress == String.Empty)// only return MAC Address from first card 

            {

               

                sMacAddress = adapter.GetPhysicalAddress().ToString();

            }

        }

        TextBox1.Text = sMacAddress;

    }

}