public PasswordChangedEvent()
    {
    }

    public PasswordChangedEvent(string hashedPassword, string salt, DateTime createdDate)
        :base(createdDate)
    {
        HashedPassword = hashedPassword;
        Salt = salt;
    }

    public string HashedPassword
    {
        private set { _hashedPassword = value; }
        get { return _hashedPassword; }
    }

    public string Salt
    {
        private set { _salt = value; }
        get { return _salt; }
    }
}

public class User : BaseReportDataObject
    {
        public string Name { get; set; }

        public string Email { get; set; }

        public string Gender { get; set; }

        public DateTime? BirthDate { get; set; }

        public string HashedPassword { get; set; }

        public string Salt { get; set; }

        public string RestoreHash { get; set; }

        public string OpenIdIdentifyer { get; set; }
    }

MongoCollection.Update(Query<PasswordChangedEvent>.EQ(ev => ev.AggregateId, evnt.AggregateId),
                                   Update<PasswordChangedEvent>
                                     .Set(ev => ev.HashedPassword, evnt.HashedPassword)
                                     .Set(ev => ev.Salt, evnt.Salt));

MongoCollection.Update(Query<ReadDto.User>.EQ(u => u.Id, evnt.AggregateId),
                                   Update<ReadDto.User>.Set(u => u.HashedPassword, evnt.HashedPassword));