asp.net วิธี Get ค่า MaxAddress ของเครื่องตัวเอง ทำยังไงครับ

using System;
 using System.Diagnostics;
 using System.Net;
 using System.Net.NetworkInformation;
 using System.Runtime.InteropServices;
 using System.Text;
namespace Yours.Truly
 {
 public class GetMacAddressFromIPAddress
 {
 private const int PING_TIMEOUT = 1000;
 public GetMacAddressFromIPAddress()
 {
     }
 private string GetMacAddress(string ipAddress)
{
string macAddress = string.Empty;
 if (!IsHostAccessible(ipAddress)) return null;
  try
  {
 ProcessStartInfo processStartInfo = new ProcessStartInfo();
 Process process = new Process();
 processStartInfo.FileName = "nbtstat";
 processStartInfo.RedirectStandardInput = false;
 processStartInfo.RedirectStandardOutput = true;
 processStartInfo.Arguments = "-a " + ipAddress;
 processStartInfo.UseShellExecute = false;
 process = Process.Start(processStartInfo);
 int Counter = -1;
 while (Counter <= -1)
  {
 Counter =  macAddress.Trim().ToLower().IndexOf("mac address", 0);
   if (Counter > -1)
 {
 break;
 }
  macAddress = process.StandardOutput.ReadLine();
 }
 process.WaitForExit();
 macAddress = macAddress.Trim();
  }
    catch (Exception e)
  {
 Console.WriteLine("Failed because:" + e.ToString());
 }
 return macAddress;
 }
 #region Getting MAC from ARP
 [DllImport("iphlpapi.dll", ExactSpelling = true)]
 static extern int SendARP(int DestIP, int SrcIP, byte[] pMacAddr,ref uint PhyAddrLen);

 private string GetMACAddressFromARP(string hostNameOrAddress)
    {
          if (!IsHostAccessible(hostNameOrAddress)) return null;
      IPHostEntry hostEntry = Dns.GetHostEntry(hostNameOrAddress);
    if (hostEntry.AddressList.Length == 0)
  return null;
 byte[] macAddr = new byte[6];
  uint macAddrLen = (uint) macAddr.Length;
  if (SendARP((int) hostEntry.AddressList[0].Address, 0, macAddr,
 ref macAddrLen) != 0)
   return null;
  StringBuilder macAddressString = new StringBuilder();
   for (int i = 0; i < macAddr.Length; i++)
     {
    if (macAddressString.Length > 0)
     macAddressString.Append(":");
     macAddressString.AppendFormat("{0:x2}", macAddr[i]);
   }
   return macAddressString.ToString();
    }
   #endregion Getting MAC from ARP

  private static bool IsHostAccessible(string hostNameOrAddress)
     {
      Ping ping = new Ping();
 PingReply reply = ping.Send(hostNameOrAddress, PING_TIMEOUT);
 return reply.Status == IPStatus.Success;
  }
  [STAThread]
  static void Main(string[] args)
    {
    bool macRequired = true;
  while (macRequired)
   {
     Console.Write("Enter the IP : ");
  string ipAddress = Console.ReadLine();
  StringComparer cp = StringComparer.OrdinalIgnoreCase;
  if (cp.Compare(ipAddress, "Exit") == 0) break;
  GetMacAddressFromIPAddress getMacAddress = new GetMacAddressFromIPAddress();
  Console.WriteLine("Please wait while I try to find the MAC address...");
  string MacAddress = getMacAddress.GetMacAddress(ipAddress);
   Console.WriteLine(MacAddress);
   } 
     }
   } 
 }