I want to use GUID as my ID System, And I want to be sure that I will always get unique ID.
Should I add a test for uniqueness?
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This is entirely up to you, but generating a new GUID (at least if you use the built in functions) is so unlikely to give a duplicate that it's not worth checking. – DavidG Sep 05 '16 at 14:12
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It is only statistically unique. – paparazzo Sep 05 '16 at 14:13
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2Old New Thing post [When you start talking about numbers as small as 2⁻¹²², you have to start looking more closely at the things you thought were zero](https://blogs.msdn.microsoft.com/oldnewthing/20160114-00/?p=92851) – Damien_The_Unbeliever Sep 05 '16 at 14:14