Updating existing data in EF 6 throws exception - “…entity of the same type already has the same primary key value.”

Question

I am trying to update a record using Entity Framework 6, code-first, no fluent mapping or a tool like Automapper.

The entity(Employee) has other composi

Answer 1

You need to detach to avoid duplicate primary key exception whist invoking SaveChanges

db.Entry(entity).State = EntityState.Detached;