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copied!<p>Xml Serialization works nicely. You use attributes to configure it. </p> <p>You can conditionally include elements. </p> <p>EDIT: <strong>I've updated the code to reflect your updated question.</strong></p> <pre><code>[XmlRoot("pdata")] // this element name used if serialized to doc root public class PersonalData { [XmlElement] // with no name here, elt name = prop name public string Name; [XmlElement] // with no name here, elt name = prop name public int Age; [XmlElement("xaddr")] // override xml element name public AddressData Address; [XmlElement] public Under18Info Other {get; set;} // serialize the above element, only if Age < 18 [XmlIgnore] // do not serialize the *Specified" property in any case private bool OtherSpecified { get { return Age < 18; } } } public class AddressData { [XmlIgnore] // do not serialize (see Composite prop) public string Line1 { get; set;} [XmlAttribute("city")] // serialize as an attribute on the parent public string City {get; set;} [XmlIgnore] // do not serialize public string Postcode {get; set;} [XmlText] // serialize as the Text node public string Composite { get { return Line1 + ", " + Postcode; } set { var split = value.Split(','); Line1 = split[0]; Postcode= split[1]; } } } </code></pre> <p>Then, to serialize an instance of that to a string, for example: </p> <pre><code>var pdata = new PersonalData { Name = "Gordon Brown", Age = 57, Address = new AddressData { Line1 = "10 Downing St.", Postcode = "1QR 3E4", City = "London" } }; var ns= new System.Xml.Serialization.XmlSerializerNamespaces(); ns.Add( "", ""); var s1 = new XmlSerializer(typeof(PersonalData)); var builder = new System.Text.StringBuilder(); var xmlws = new System.Xml.XmlWriterSettings { OmitXmlDeclaration = true, Indent= true }; using ( var writer = System.Xml.XmlWriter.Create(builder, xmlws)) { s1.Serialize(writer, pdata, ns); } string xml = builder.ToString(); </code></pre> <p>Results:</p> <pre><code><pdata> <Name>Gordon Brown</Name> <Age>57</Age> <xaddr city="London">10 Downing St., 1QR 3E4</xaddr> </pdata> </code></pre>

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