Override_SaveChanges_EntityFramework 1.0.0

public partial class Entities : DbContext { public Entities() : base("name=Entities") { }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        throw new UnintentionalCodeFirstException();
    }
	public override int SaveChanges()
        {
        var origional = this.ChangeTracker
                                .Entries()
                                .Where(e => e.State == EntityState.Added 
                                    || e.State == EntityState.Modified)
                                .Select(p => p.Entity as User);
        origional.FirstOrDefault().firstName = "changedByOverrideSaveChanges" 
                                                + origional.FirstOrDefault().firstName;
        //origional.FirstOrDefault().lastName = "changedLastName";
            //foreach (var row in this.ChangeTracker.Entries().Where(e => e.State == EntityState.Added || e.State == EntityState.Modified).Select(e => e.Entity as User))
            //{
            //    row.firstName = "changeOnSaveOverride";
            //    row.lastName = "lastNameChangedOnOverride";
            //}
            int result = base.SaveChanges();
            return result;
        }

    public virtual DbSet<C__MigrationHistory> C__MigrationHistory { get; set; }
    public virtual DbSet<User> Users { get; set; }
}