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DataContractSerializer vs. BinaryFormatter Performance

I was going through articles to learn more about datacontractserializer and binary matrix serializers. Based on the readings made so far, I got the impression that the binary format should be smaller than the datacontractserializer. Reason: The DataContractSerializer is serialized to xml-infoset, while the binary format is being converted to its own binary format.

Below is the test

    [Serializable]
    [DataContract]
    public class Packet
    {
        [DataMember]
        public DataSet Data { get; set; }
        [DataMember]
        public string Name { get; set; }
        [DataMember]
        public string Description { get; set; }
    }

DataSet was populated with 121317rows from [AdventureWorks].[Sales].[SalesOrderDetail]table

    using (var fs = new FileStream("test1.txt", FileMode.Create))
    {
        var dcs = new DataContractSerializer(typeof(Packet));
        dcs.WriteObject(fs, packet);
        Console.WriteLine("Total bytes with dcs = " + fs.Length);
    }



    using(var fs = new FileStream("test2.txt", FileMode.Create))
    {
       var bf = new BinaryFormatter();
       bf.Serialize(fs, packet);
       Console.WriteLine("Total bytes with binaryformatter = " + fs.Length);
    }


Results
Total bytes with dcs = 57133023
Total bytes with binaryformatter = 57133984

Question Why is the number of bytes for binary formatting greater than the datacontractserializer? Isn't that a lot less?

+5
1

DataSet : ISerializable, XML , BinaryFormatter. . RemotingFormat Binary, , BinaryFormatter, MemoryStream, BinaryFormatter.

, BinaryFormatter , , ; , XML DataSet.

, DataSet , .

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