.NET Short Unique Identifier

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This one a good one – http://www.singular.co.nz/blog/archive/2007/12/20/shortguid-a-shorter-and-url-friendly-guid-in-c-sharp.aspx

and also here
YouTube-like GUID

You could use Base64:

string base64Guid = Convert.ToBase64String(Guid.NewGuid().ToByteArray());

That generates a string like E1HKfn68Pkms5zsZsvKONw==. Since a GUID is
always 128 bits, you can omit the == that you know will always be
present at the end and that will give you a 22 character string. This
isn’t as short as YouTube though.

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