ASP.Net: How to log login-trys correctly? -

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i have login in admin page.

now want log every login-try in database. normaly have log-table adminid in foreign key of adminuser-table.

now, of course, when try login username doesn't exist, haven't id , foraign-key uses crash in write-attamp.

now whats correct way log login-try when username isn't correct , haven't correct id?

1) add second log-table such things or 2) remove foraign key in first log-table

why not have adminid field nullable field? way, distinguish between successful , unsuccessful login attempts.


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