Looking for c# code to get usb serial #

Question

Possible Duplicate:
How to get serial number of USB-Stick in C#

Does anybody have any suggestions, preferably something that would work across windows 7 and xp, I already tried the class posted here http://www.cfdan.com/posts/Retrieving_Non-Volatile_USB_Serial_Number_Using_C_Sharp.cfm however a serial number is never returned.

I understand that the serial number on a usb is optional but I have tried 3 separate usb sticks so I doubt this is the problem.

Answer 1

From this post:

ManagementObjectSearcher theSearcher = new ManagementObjectSearcher("SELECT * FROM Win32_DiskDrive WHERE InterfaceType='USB'");
foreach (ManagementObject currentObject in theSearcher.Get())
{
   ManagementObject theSerialNumberObjectQuery = new ManagementObject("Win32_PhysicalMedia.Tag='" + currentObject["DeviceID"] + "'");
   MessageBox.Show(theSerialNumberObjectQuery["SerialNumber"].ToString());
}