How to make a short URL friendly GUID in C#

Been trying my own hack to make a short GUID for a web form submission, but hit issues with incompatible characters. Just before making more changes I came across this excellent blog and code to easily convert GUIDs to Short GUIDs and back.

I have found this especially useful when sending unique vendor transaction refs to the SagePay forms service as they have a 40 character limit.

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

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