Read MAC Address using asp.net

using  System.Management;

protected void Page_Load(object sender, EventArgs e)

    {

        string MacAdd = GetMACAddress();

        Response.Write("Mac Address is : " + MacAdd);

    }

   public string GetMACAddress()

    {

      ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguratin");

        ManagementObjectCollection moc = mc.GetInstances();

        string MacAdd = String.Empty;

        foreach (ManagementObject mo in moc)

        {

            if (MacAdd == String.Empty)

            {

                if ((bool)mo["IPEnabled"] == true) MacAdd = mo["MacAddress"].ToString();

            }

            mo.Dispose();

        }

        MacAdd = MACAddress.Replace(":", "");

        return MacAdd;

    }