/// <summary>
        /// 获取网卡物理地址
        /// </summary>
        /// <returns></returns>
        public static string getMacAddr_Local()
        {
            string madAddr = null;
            ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
            ManagementObjectCollection moc2 = mc.GetInstances();
            foreach (ManagementObject mo in moc2)
            {
                if (Convert.ToBoolean(mo["IPEnabled"]) == true)
                {
                    madAddr = mo["MacAddress"].ToString();
                    madAddr = madAddr.Replace(':', '-');
                }
                mo.Dispose();
            }
            return madAddr;
        }

        //下面一种方法可以获取远程的MAC地址
        [DllImport("Iphlpapi.dll")]
        static extern int SendARP(Int32 DestIP, Int32 SrcIP, ref Int64 MacAddr, ref Int32 PhyAddrLen);
        [DllImport("Ws2_32.dll")]
        static extern Int32 inet_addr(string ipaddr);        
        /// <summary>
        /// SendArp获取MAC地址
        /// </summary>
        /// <param name="RemoteIP">目标机器的IP地址如(192.168.1.1)</param>
        /// <returns>目标机器的mac 地址</returns>
        public static string getMacAddr_Remote(string RemoteIP)
        {
            StringBuilder macAddress = new StringBuilder();
            try
            {
                Int32 remote = inet_addr(RemoteIP);
                Int64 macInfo = new Int64();
                Int32 length = 6;
                SendARP(remote, 0, ref macInfo, ref length);
                string temp = Convert.ToString(macInfo, 16).PadLeft(12, '0').ToUpper();
                int x = 12;
                for (int i = 0; i < 6; i++)
                {
                    if (i == 5)
                    {
                        macAddress.Append(temp.Substring(x - 2, 2));
                    }
                    else
                    {
                        macAddress.Append(temp.Substring(x - 2, 2) + "-");
                    }
                    x -= 2;
                }
                return macAddress.ToString();
            }
            catch
            {
                return macAddress.ToString();
            }
        }

string MacAddress;
//设置MAC地址
string MAC=""; 
ManagementClass MC = new ManagementClass ( "Win32_NetworkAdapterConfiguration" ); 
ManagementObjectCollection MOC = MC.GetInstances(); 
foreach ( ManagementObject moc in MOC ) 
{ 
 if ( moc["IPEnabled"].ToString() == "True") 
 { 
  MAC = moc["MacAddress"].ToString(); 
 }
}
MacAddress=MAC;

using System.Management;
using System.Runtime.InteropServices; 
using System.Text;  
using System.Text.RegularExpressions;

string strsearch=string.Format(@"SELECT MACAddress FROM Win32_NetworkAdapter WHERE ((MACAddress Is Not NULL)AND (Manufacturer <> 'Microsoft'))");

System.Management.ManagementObjectSearcher msearch=new ManagementObjectSearcher();  
msearch.Scope=new ManagementScope(@"root/CIMV2"); 
msearch.Query=new ObjectQuery(strsearch); 
ArrayList MacList  =new ArrayList();
int i =0;
try 
{ 
 if((msearch.Get().Count<1) || (msearch.Get()==null)) 
 { 
  MessageBox.Show("No MAC Address!"); 
 } 
 else 
 { 
  MessageBox.Show("MAC Address No. is : "+ msearch.Get().Count.ToString()); 
  foreach(System.Management.ManagementObject mymac in msearch.Get()) 
  { 
   string str1=string.Format("MAC{0} address:{1}",i.ToString(),mymac["MACAddress"].ToString()); 
   MessageBox.Show("MAC Address "+i.ToString()+":"+str1); 
   MacList.Add(str1);
   i++; 
  } 
 } 
} 
catch(Exception ex) 
{ 
 string msg=ex.Message.ToString(); 
 MessageBox.Show("erro", msg); 
}

using System.Management;
using System.Runtime.InteropServices; 
using System.Text;  
using System.Text.RegularExpressions; 

[DllImport("Iphlpapi.dll")]   
private static extern int SendARP(Int32 dest,Int32 host,ref Int32 mac,ref Int32 length);   
[DllImport("Ws2_32.dll")]   
private static extern Int32 inet_addr(string ip);  

string IPAddress=System.Net.Dns.GetHostByName(System.Net.Dns.GetHostName()).AddressList[0].ToString();
MessageBox.Show("ip: "+IPAddress);
string mac = this.GetMACFromIP(IPAddress);
MessageBox.Show("mac: "+mac);

private   string   GetMACFromIP(string   A_strIP)   
  {   
   string   strRet   =   "Unknown";   
    
   string   strIPPattern   =   @"^/d+/./d+/./d+/./d+$";   
    
   Regex   objRex   =new   Regex(strIPPattern);   
    
   if(objRex.IsMatch(A_strIP)   ==   true)   
   {   
    Int32   intDest   =   inet_addr(A_strIP);   
    Int32   []   arrMAC   =   new   Int32[2];   
    Int32   intLen   =   6;   
    
    int   intResult   =   SendARP(intDest,0,ref   arrMAC[0],ref   intLen);   
    
    if(intResult   ==   0)   
    {   
     Byte   []   arrbyte   =   new   Byte[8];   
     arrbyte[5]   =   (Byte)(arrMAC[1]   >>   8);   
     arrbyte[4]   =   (Byte)arrMAC[1];   
     arrbyte[3]   =   (Byte)(arrMAC[0]   >>   24);   
     arrbyte[2]   =   (Byte)(arrMAC[0]   >>   16);   
     arrbyte[1]   =   (Byte)(arrMAC[0]   >>   8);   
     arrbyte[0]   =   (Byte)arrMAC[0];   
    
     StringBuilder   strbMAC   =   new   StringBuilder();   
    
     for(int   intIndex   =   0   ;intIndex   <   6;intIndex   ++)   
     {   
      if(intIndex   >   0)   strbMAC.Append("-");   
      strbMAC.Append(arrbyte[intIndex].ToString("X2"));   
     }   
     strRet   =   strbMAC.ToString();   
    }   
   }   
   return   strRet;   
  }