Retrieving Serial Number of BIOS

Nowadays, i have been working on Windows Desktop Application. In this project, i need to match application's serial number and BIOS' serial number to prevent illegal usage. To retrieve BIOS number of computer i  used WMI Classes with .NET Framework namespace called System.Management. If you need to retrieve Serial Number of BIOS you can use following code snippet :

   1:  ManagementObjectSearcher wmiQuery = new ManagementObjectSearcher("SELECT * FROM Win32_BIOS");

   2:  ManagementObjectCollection wmiColl = wmiQuery.Get();

   3:   

   4:  foreach (ManagementObject item in wmiColl)

   5:  {

   6:     Console.WriteLine(item.GetPropertyValue("SerialNumber"));

   7:  }

If you want to check other properties' name of Win32_BIOS, click to see link written below :
http://msdn.microsoft.com/en-us/library/aa394077(VS.85).aspx