When creating a foreign key to the membership user table, is it better to refer to the user_id column or is it ok to use the username column? I assume that the Membership spec enforces uniqueness in the username since there is a method Membership.GetUser(username) that returns one user. Using the id is a bit awkward in code because I have to end up casting all over the place like (int)user.ProviderUserKey. The username would give more information quickly when viewing raw data as well. Just wondering if someone knows a reason why I shouldn't use it as the foreign key.
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