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Editorial Team
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Asked: 2026-05-16T00:10:37+00:00

I looked up the msdn documentation and it says that InvalidUserName is thrown when

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I looked up the msdn documentation and it says that InvalidUserName is thrown when it does not find the username in the database, which is fine because the user I am creating should not exist in the database.

If I use test@example.com, it works, but if I try it with test.@example.com, the status from Membership.CreateUser is InvalidUserName.

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1 Answer

  1. Editorial Team

    Email addresses come in the form username@domain where domain is at least two parts separated by a period/dot.

    The RFC Specification says that a . in the username part of the address (the part before @) is valid unless the . is the first or last character (of the username), so the behaviour that you are noticing is correct.

    https://www.rfc-editor.org/rfc/rfc5322

    Good find @David Stratton: From the wikipedia link in his comment…

    Character . (dot, period, full stop)
    provided that it is not the first or
    last character, and provided also that
    it does not appear two or more times
    consecutively (e.g.
    John..Doe@example.com).

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