public override bool Equals(object obj)
        {
            if (obj.GetType() == typeof(BiffRecord) ||
                obj.GetType().IsSubclassOf(typeof(BiffRecord)))
            {
                BiffRecord br = (BiffRecord)obj;
                if (br.Id == Id &&
                    br.Length == Length)
                {
                    byte[] recordBytes = br.GetBytes();
                    return(recordBytes.SequenceEqual(GetBytes()));
                }
            }

            return(false);
        }