Kenny, you don't show your code, but something fishy is going on.

1.  De-serializing from
....I get name=Joe, Age=37 and AgeSpecified = true (not false as you report).

Also, changing the Name from Joe to Bob should not affect Age or
AgeSpecified, as you report.   Also, changing Age does not directly affect
AgeSpecified.  These things are true, unless you have put some non-default
handling in the property getter/setter.


This is the default behavior?, so I don't understand why you are asking
this.  The code enclosed below demonstrates this, and some other interesting
things in XML serialization.

In fact you have to do something special in order to get an empty element
(eg "<Age />")  to appear in an XML stream output from the .NET XML
Serializer.   If you use isnullable:=True in the XmlElementAttribute, you
will get <Age xsi:nil="true" />, which is not quite the same thing.


-Dino




----- Begin Code -----
// XmlIgnoreTest.cs
//
// Exercises some of the XmlIgnore stuff
//
// compile with:
//
// (c) Ionic Shade
// Wed, 17 Nov 2004  10:02
//

using System.IO;
using System.Xml.Serialization;


// This is the default class generated from xsd.exe
[System.Xml.Serialization.XmlRootAttribute(Namespace="", IsNullable=false)]
public class Person {

  [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]
  public string Name;

  [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]
  public System.Single Age;

  [System.Xml.Serialization.XmlIgnoreAttribute()]
  public bool AgeSpecified;
}




namespace Ionic {

  public class XmlTextWriterFormattedNoDeclaration :
System.Xml.XmlTextWriter {
    public XmlTextWriterFormattedNoDeclaration (System.IO.TextWriter w) :
base(w) { Formatting= System.Xml.Formatting.Indented;}
    public override void WriteStartDocument () { }
  }


  public class TestDriver {

    static void Main(string[] args) {

      try {

        string OriginalXml=
          "<Person>\n" +
          "  <Name>Joe</Name>\n" +
          "  <Age>37</Age>\n" +
          "</Person>\n" +
          "";

        System.Console.WriteLine("\n============================================\nOriginal
XML:\n"+ OriginalXml);

        XmlSerializer s1 = new XmlSerializer(typeof(Person));
        Person p= null;
        using (System.IO.StringReader sr= new
System.IO.StringReader(OriginalXml)) {
          p = (Person) s1.Deserialize(sr);
        }



        // suppress default namespace entries in the root elt
        XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
        ns.Add( "", "" );

        // use a custom TextWriter to suppress the XML declaration

        System.Console.WriteLine("\n============================================\nOriginal
values:");
        s1.Serialize(new
XmlTextWriterFormattedNoDeclaration(System.Console.Out), p, ns);
        System.Console.WriteLine("\n");

        System.Console.WriteLine("\n============================================\nChanging
the name does not change the age:");
        p.Name= "Bob";
        s1.Serialize(new
XmlTextWriterFormattedNoDeclaration(System.Console.Out), p, ns);
        System.Console.WriteLine("\n");


        System.Console.WriteLine("\n============================================\nUn-specifying
the Age results in this:");
        p.AgeSpecified= false;
        s1.Serialize(new
XmlTextWriterFormattedNoDeclaration(System.Console.Out), p, ns);
        System.Console.WriteLine("\n");


        string OriginalXml2=
          "<Person>\n" +
          "  <Name>Shirley</Name>\n" +
          "  <Age />\n" +
          "</Person>\n" +
          "";
        System.Console.WriteLine("\n============================================\nCase
2: Original XML:\n"+ OriginalXml2);
        p=null;
        try {
          System.Console.WriteLine("\n(De-serializing from this will
fail...)\n");
          using (System.IO.StringReader sr= new
System.IO.StringReader(OriginalXml2)) {
            p = (Person) s1.Deserialize(sr);
          }
        }
        catch (System.InvalidOperationException ex1) {
          System.Console.WriteLine("As Expected, an Exception was generated:
" + ex1);

        }

        if (p!= null) {
          System.Console.WriteLine("\n============================================\nOriginal
values:");
          s1.Serialize(new
XmlTextWriterFormattedNoDeclaration(System.Console.Out), p, ns);
          System.Console.WriteLine("\n");
        }

        p= new Person();
        p.Name= "Henry";
        System.Console.WriteLine("\n============================================\nNew
Instance, setting only Name:");
        s1.Serialize(new
XmlTextWriterFormattedNoDeclaration(System.Console.Out), p, ns);
        System.Console.WriteLine("\n");

        p.Age= 66;
        System.Console.WriteLine("\n============================================\nalso
setting Ageon that instance:");
        s1.Serialize(new
XmlTextWriterFormattedNoDeclaration(System.Console.Out), p, ns);
        System.Console.WriteLine("\n");

        p.AgeSpecified= true;
        System.Console.WriteLine("\n============================================\nand
now setting AgeSpecified:");
        s1.Serialize(new
XmlTextWriterFormattedNoDeclaration(System.Console.Out), p, ns);
        System.Console.WriteLine("\n");

      }
      catch (System.Exception e1) {
        System.Console.WriteLine("Exception!\n" + e1);
      }
    }
  }
}

----- End Code -----


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Error using XMLTextReader to read XMLDocument
XmlSerializer
Date Formate when using ds.WriteXml
Restrictions on Attributes in XML Schema.
app.config xml file and application blocks