Does UserId data type affect FormsAuthentication.SetAuthCookie(UserId.ToString(), false)?

Posted by FreshCode on Stack Overflow See other posts from Stack Overflow or by FreshCode
Published on 2010-04-16T10:56:24Z Indexed on 2010/04/16 11:23 UTC
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asp.net-mvc

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formsauthentication

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cookies

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setauthcookie

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datatypes

Does the original data type of the username string in a call to FormsAuthentication.SetAuthCookie(...) make any difference with regards to security or code maintainability?

As I understand it, the cookie is encrypted and used to identify a user on each request. I'm curious whether it should affect the design of the primary key on my Users table in my database, eg. Guid vs int or a unique username string.

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