Which is the best way to generate unique serial number? [closed]

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I develop an application that needs to have a licence. It should be unique per machine. In the earlier versions I used Windows serial number for this purpose: i read it from Win, made some tricks/encryption on it to generete serial number & lic file. It was my own solution, in my new project I'd like to make a new one.

My question is: Is there a widely used way to generate unique serial numbers? Any, which is based on some hardware serial number, like motherboard or processor etc.?

(.Net4/C#/VS2010)

Thanks in advance!

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GUID.

Guid g = Guid.NewGuid();
Console.WriteLine(g.ToString());

Look here to understand the options you have in Guid's ToString()

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using guid?

GUIDs can be created in a number of ways, but usually they are a combination of a few unique settings based on specific point in time (e.g., an IP address, network MAC address, clock date/time, etc.).