MAC-Adresse in C# auslesen

public string GetMacAddress(string ipAddress)

        {

            string macAddress = string.Empty;

            System.Diagnostics.Process pProcess = new System.Diagnostics.Process();

            pProcess.StartInfo.FileName = "arp";

            pProcess.StartInfo.Arguments = "-a " + ipAddress;

            pProcess.StartInfo.UseShellExecute = false;

            pProcess.StartInfo.RedirectStandardOutput = true;

            pProcess.StartInfo.CreateNoWindow = true;

            pProcess.Start();

            string strOutput = pProcess.StandardOutput.ReadToEnd();

            string[] substrings = strOutput.Split('-');

            if (substrings.Length >= 8)

            {

                macAddress = substrings[3].Substring(Math.Max(0, substrings[3].Length - 2))

                            + "-" + substrings[4] + "-" + substrings[5] + "-" + substrings[6]

                            + "-" + substrings[7] + "-"

                            + substrings[8].Substring(0, 2);

                return macAddress;

            }

            else

            {

                return string.Empty;

            }

        }