Non Unique Username with ASP.Net Identity 2.0 -

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i have situation username not unique. email used username , 1 email can have many different passwords in database , legitimate. how use asp.net identity 2.0 in situation. 

var result = await signinmanager.passwordsigninasync(model.username, model.password, model.rememberme, shouldlockout: false);

above line expects 1 user in database. if multiple records returned - returns failure. expected logic doesn't work me.

how override logic?

alternatively, ready customize login problem - not sure things done part of passwordsigninasync. adding cookies etc. please help.

i made work. had use username + password combination unique username.
these different situations in industry different types of needs.


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