string cpuInfo = string.Empty;

ManagementClass mc = new ManagementClass("win32_processor");

ManagementObjectCollection moc = mc.GetInstances();

​

foreach (ManagementObject mo in moc)

{

     if (cpuInfo == "")

     {

          //Get only the first CPU's ID

          cpuInfo = mo.Properties["processorID"].Value.ToString();

          break;

     }

}

return cpuInfo;