ASP.NET取客戶機MAC地址

using System.Text.RegularExpressions;
using System.Diagnostics;
public class test
...{
        public test
        ...{}
        public static string GetCustomerMac(string IP) //para IP is the client's IP 
        ...{ 
               string dirResults=""; 
               ProcessStartInfo psi  = new ProcessStartInfo(); 
               Process proc = new Process(); 
               psi.FileName = "nbtstat"; 
               psi.RedirectStandardInput = false; 
               psi.RedirectStandardOutput = true; 
               psi.Arguments = "-A " + IP; 
               psi.UseShellExecute = false; 
               proc = Process.Start(psi); 
               dirResults = proc.StandardOutput.ReadToEnd(); 
               proc.WaitForExit(); 
               dirResults=dirResults.Replace(" ","").Replace(" ","").Replace(" ",""); 

              Regex reg=new Regex("Mac[ ]{0,}Address[ ]{0,}=[ ]{0,}(?<key>((.)*?)) __MAC",RegexOptions.IgnoreCase|RegexOptions.Compiled); 
               Match mc=reg.Match(dirResults+"__MAC"); 

           if(mc.Success) 
            ...{ 
                return mc.Groups["key"].Value; 
           } 
            else 
           ...{ 
                reg=new Regex("Host not found",RegexOptions.IgnoreCase|RegexOptions.Compiled); 
                mc=reg.Match(dirResults); 
            if(mc.Success) 
            ...{ 
                 return "Host not found!"; 
            } 
            else 
            ...{ 
                 return ""; 
            } 
       } 
  }
}