Getting MAC Address of Client Machine in C#

//Add the following Using
 using System;
 using System.IO;

 // Add a webform in your web app and modify the code for Page_Load event as follows:
 protected void Page_Load(object sender, EventArgs e)
 {
     string MyDomainPrefix = @"CONTOSO\\"; //replace CONTOSO with your network domain
     string currentUserLoginName = Request.LogonUserIdentity.Name.Replace(MyDomain, string.Empty); // Get the current Windows authenticated user
     string myCommandToRun = "/c nbtstat -a " + Request.UserHostName + @" >> " + AppDomain.CurrentDomain.BaseDirectory +
 currentUserLoginName + ".txt"; //     Command line to run, I am creating my text file in the web application folder on the server.
 Note: nbtstat command does not work on my client machine with Windows 7.
     //Execute the command
     System.Diagnostics.Process process = new System.Diagnostics.Process();
     process.StartInfo.CreateNoWindow = true;
     process.StartInfo.FileName = "cmd.exe";
     process.StartInfo.Arguments = myCommandToRun;
     process.Start();
     process.WaitForExit();
     //Start parsing the file created on disk
     StreamReader sr = new StreamReader(AppDomain.CurrentDomain.BaseDirectory + currentUserLoginName + ".txt");
     string MyLine = null;
     MyLine = sr.ReadToEnd();
     string[] MyStrings = MyLine.Trim().Split('\n'); //Array of strings from text file split by the return char
     foreach (string item in MyStrings)
     {
         if (item.Trim().Contains("MAC Address"))
         {
             //Get the MAC Address
             Response.Write(item.ToString().Remove(0,item.IndexOf('=')+1).Trim());
         }
     }
 }