public string getCpuInfo()  //读取CPU信息          {              ManagementClass mobj = new ManagementClass("Win32_Processor");              ManagementObjectCollection moc = mobj.GetInstances();              foreach (ManagementObject mo in moc)              {                  return mo.Properties["ProcessorId"].Value.ToString();              }              return "";          }          public string getHddInfo()  //读取硬盘信息          {              ManagementClass mobj = new ManagementClass("Win32_PhysicalMedia");              ManagementObjectCollection moc = mobj.GetInstances();              foreach (ManagementObject mo in moc)              {                  return mo.Properties["SerialNumber"].Value.ToString();              }              return "";          }