DataContractSerializer – Alphabetical mystique
http://msdn.microsoft.com/en-us/library/system.runtime.serialization.datacontractserializer.aspx I noticed that DataContractSerializer is using serialization in alphabetical order. If you do not follow the below rules you will end up missing data after deserialization of your XML. [Serializable, DataContract(Namespace = "your-namespace")] public class YourObject : DataModelDeserializable<YourObject> { [DataMember] public string PostalCode { get; set; } [DataMember] [...]