How to create serial number generator? [closed]

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How can I program a Serial Number Generator that generates serial numbers for some existing software?

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You don't state any specific requirements but you can use a GUID.

Guid mySerialNumber = Guid.NewGuid();

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I have used this CodeProject Article before when I've needed to do the same thing for projects I have worked on recently. I found it very detailed and while I didn't use everything in the sample I did get a lot out of it. (I have no affiliation with CodeProject or the author)

Additionally there is a library which gives you all this functionality complete with license file replacement and heaps of other features, but its not free, and unfortunately I couldn't remember the link. I'm sure a bit of Googgling and you'll find it.

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public static string GetSerialKeyAlphaNumaric(SNKeyLength keyLength)
{
    string newSerialNumber = "";
    string SerialNumber=Guid.NewGuid().ToString("N").Substring(0, (int)keyLength).ToUpper(); 
    for(int iCount=0; iCount < (int) keyLength   ;iCount +=4)
        newSerialNumber = newSerialNumber + SerialNumber.Substring(iCount, 4) + "-";
    newSerialNumber = newSerialNumber.Substring(0, newSerialNumber.Length - 1); 
    return newSerialNumber;
}

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Try a number you can test using Luhn's algorithm. That way, you can make it long an inscrutable, yet still easily confirmed. The article contains a link to a C# implementation.