/// <summary>  
        /// 获取本机 机器名   
        /// </summary>  
        /// <returns></returns>  
        public static string GetMachineName()
          {        
                       return Environment.GetEnvironmentVariable("COMPUTERNAME");
           }   

        /// <summary>  
        /// 获取本机的MAC地址  
        /// </summary>  
        /// <returns></returns>  
        public static string GetLocalMac()
        {
            string mac = null;
            ManagementObjectSearcher query = new ManagementObjectSearcher("SELECT * FROM Win32_NetworkAdapterConfiguration");
            ManagementObjectCollection queryCollection = query.Get();
            foreach (ManagementObject mo in queryCollection)
            {
                if (mo["IPEnabled"].ToString() == "True")
                    mac = mo["MacAddress"].ToString();
            }
            return (mac);
        }  

        /// <summary>
        /// 取得设备硬盘的卷标号
        /// </summary>
        /// <returns></returns>
        public string GetDiskVolumeSerialNumber()
        {
            ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
            ManagementObject disk = new ManagementObject("win32_logicaldisk.deviceid=\"c:\"");
            disk.Get();
            return disk.GetPropertyValue("VolumeSerialNumber").ToString();
        }

        /// <summary>
        /// 获得CPU的序列号
        /// </summary>
        /// <returns></returns>
        public string getCpu()
        {
            string strCpu = null;
            ManagementClass myCpu = new ManagementClass("win32_Processor");
            ManagementObjectCollection myCpuConnection = myCpu.GetInstances();
            foreach (ManagementObject myObject in myCpuConnection)
            {
                strCpu = myObject.Properties["Processorid"].Value.ToString();
                break;
            }
            return strCpu;
        }