Unique constraint in Entity Framework [duplicate]

Question

How can one set some attribute in Entity (Entity Framework) to be unique? One possibility would be to make it primary key but that's not what I want.

Answer 1

Entity framework doesn't support unique keys so the only way is to set the unique constraint / index in the database. It will not ensure uniqueness in the application when you try to insert / update records but the exception will be fired if you try to save non unique value to the database.