用ASP.Net获取客户端网卡的MAC

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("\r","").Replace("\n","").Replace("\t","");

Regex reg=new Regex("Mac[ ]{0,}Address[ ]{0,}=[ ]{0,}(?

 1<key>((.)*?)) __MAC",RegexOptions.IgnoreCase|RegexOptions.Compiled);   
 2Match mc=reg.Match(dirResults+"__MAC"); 
 3
 4if(mc.Success)   
 5{   
 6return mc.Groups["key"].Value;   
 7}   
 8else   
 9{   
10reg=new Regex("Host not found",RegexOptions.IgnoreCase|RegexOptions.Compiled);   
11mc=reg.Match(dirResults);   
12if(mc.Success)   
13{   
14return "Host not found!";   
15}   
16else   
17{   
18return "";   
19}   
20}   
21}   
22}</key>