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So in my simple learning website, I use the built in ASP.NET authentication system. I am adding now a user table to save stuff like his zip, DOB etc. My question is: In the new table, should the key be the user name (the string) or the user ID which is that GUID looking number they use in the asp_ tables . If the best practice is to use that ugly guid, does anyone know how to get it? it seems to not be accessible as easily as the name ( System.Web.HttpContext.Current.User.Identity.Name ) If you suggest I use neither (not the guid nor the userName fields provided by ASP.NET authentication) then how do I do it with ASP.NET authentication? One option I like is to use the email address of the user as login, but how to I make ASP.NET authentication system use an email address instead of a user name? (or there is nothing to do there, it is just me deciding I "know" userName is actually an email address? Please note: I am not asking on how get a GUID in .NET, I am just referring to the userID column in the asp_ tables as guid. The user name is unique in ASP.NET authentication.

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