EntityState.Added can be set in two fully equivalent ways:
By setting the state of its entry in the context:
context.Entry(entity).State = EntityState.Added;
By adding it to a
DbSet of the context:
SaveChanges, the entity will be inserted into the database. When it's got an identity column (an auto-set, auto-incrementing primary key), then after
SaveChanges, the primary key property of the entity will contain the newly generated value, even when this property already had a value.