private static string GetIdentifier(string wmiClass, string wmiProperty, string wmiMustBeTrue) 
    { 
      string result = ""; 
      System.Management.ManagementClass mc = new System.Management.ManagementClass(wmiClass); 
      System.Management.ManagementObjectCollection moc = mc.GetInstances(); 
      foreach (System.Management.ManagementObject mo in moc) 
      { 
        if (mo[wmiMustBeTrue].ToString() == "True") 
        { 
          //Only get the first one 
          if (result == "") 
          { 
            try 
            { 
              result = mo[wmiProperty].ToString(); 
              break; 
            } 
            catch 
            { 
            } 
          } 
        } 
      } 
      return result; 
    } 
 
 
    private static string GetIdentifier(string wmiClass, string wmiProperty) 
    { 
      string result = ""; 
      System.Management.ManagementClass mc = new System.Management.ManagementClass(wmiClass); 
      System.Management.ManagementObjectCollection moc = mc.GetInstances(); 
      foreach (System.Management.ManagementObject mo in moc) 
      { 
        //Only get the first one 
        if (result == "") 
        { 
          try 
          { 
            result = mo[wmiProperty].ToString(); 
            break; 
          } 
          catch 
          { 
          } 
        } 
      } 
      return result; 
    } 
 
 
 
 
 
 
// cpu id  
GetIdentifier("Win32_Processor", "UniqueId"); 
 
 
//processor id 
GetIdentifier("Win32_Processor", "ProcessorId"); 
 
 
//processor name 
GetIdentifier("Win32_Processor", "Name"); 
 
 
 
 
//Manufacturer 
GetIdentifier("Win32_Processor", "Manufacturer"); 
 
 
 
 
//BIOS Identifier 
    private static string GetBiosId() 
    { 
      return GetIdentifier("Win32_BIOS", "Manufacturer") 
      + GetIdentifier("Win32_BIOS", "SMBIOSBIOSVersion") 
      + GetIdentifier("Win32_BIOS", "IdentificationCode") 
      + GetIdentifier("Win32_BIOS", "SerialNumber") 
      + GetIdentifier("Win32_BIOS", "ReleaseDate") 
      + GetIdentifier("Win32_BIOS", "Version"); 
    } 
    //Main physical hard drive ID 
    private static string GetDiskId() 
    { 
      return GetIdentifier("Win32_DiskDrive", "Model") 
      + GetIdentifier("Win32_DiskDrive", "Manufacturer") 
      + GetIdentifier("Win32_DiskDrive", "Signature") 
      + GetIdentifier("Win32_DiskDrive", "TotalHeads"); 
    } 
    //Motherboard ID 
    private static string GetBaseId() 
    { 
      return GetIdentifier("Win32_BaseBoard", "Model") 
      + GetIdentifier("Win32_BaseBoard", "Manufacturer") 
      + GetIdentifier("Win32_BaseBoard", "Name") 
      + GetIdentifier("Win32_BaseBoard", "SerialNumber"); 
    } 
    //Primary video controller ID 
    private static string GetVideoId() 
    { 
      return GetIdentifier("Win32_VideoController", "DriverVersion") 
      + GetIdentifier("Win32_VideoController", "Name"); 
    } 
    //First enabled network card ID 
    private static string GetMacId() 
    { 
      return GetIdentifier("Win32_NetworkAdapterConfiguration", "MACAddress", "IPEnabled"); 
    }