Motherboard Serial Number

Hello, I'm trying to get the serial number of the motherboard with the following code: CODE string SerialNumber = ""; ManagementObjectSearcher mbs = new ManagementObjectSearcher("Select * From Win32_BaseBoard"); foreach (ManagementObject mo in mbs.Get()) { SerialNumber = mo["SerialNumber"].ToString().Trim(); } return SerialNumber; It appears to work, however the number returned does not match the manufacture serial number. Does anyone know of a better method, or a way to getting the actual manufacture serial number.