Need suggestions on creating a "fingerprint" for a machine.

[Sergio Tapia]

I'm trying to create a fingerprint of a machine fetching certain information from the hardware that is unique to it. For example, a hard drives serial number.

So I'd like to fetch X amount of information and hash it. This hash will be saved remotely on a whitelist that the client would have to consult with before actually running the application.

How do I get this information using C# and .NET 3.5?

First up, I've tried fetching the MAC address of the machine, but on my machine this raises a NullReferenceException:

static void Main(string[] args)
{
    ManagementClass oMClass = new ManagementClass("Win32_NetworkAdapterConfiguration");

    ManagementObjectCollection colMObj = oMClass.GetInstances();

    foreach (ManagementObject objMO in colMObj)
    {
        Console.WriteLine(objMO["MACAddress"].ToString());
    }

    Console.ReadKey(true);
}

Any suggestions?