Attaching databases results in error "The server principal is not able to access the database" -

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i have 2 databases want attach them sql server express.

when try user account, recieve login failed error.

this code sets owner of databases current user

use [databasename]  create user[domainname\\username] login [domainname\\username]  exec sp_addrolemember 'db_owner','domainname\\username'

this works first database second 1 receive error:

the server principal not able access database

how can done programmatically?

you should change database owner

exec sp_changedbowner 'yourlogin',null

and 

alter database [your_db] set trustworthy on

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