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mydata xmldoc = new mydata();          // xml-Schema-Struktur
xmldoc.header = new header();
xmldoc.header.date = DateTime.Now;       // Datum
xmldoc.header.description = "Testdaten"; // String
xmldoc.header.primaryKey = primaryKey;   // uint
...
// Datei schreiben
FileStream fs = new FileStream(testdatenpfad + @"\test.xml", FileMode.Create);
try
{
    XmlSerializer xmlSerializer = new XmlSerializer(typeof(mydata));
    xmlSerializer.Serialize(fs, xmldoc);
}
finally
{
    fs.Close();
}					

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<?xml version="1.0"?>
<mydata xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <header>
    <date>2009-06-24T07:38:56.2815154+02:00</date>
    <description>Testdaten</description>
  </header>
  <content>
  </content>
</mydata>					

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[System.Xml.Serialization.XmlIgnoreAttribute()]
        public bool primaryKeySpecified
        {
            get
            {
                return this.primaryKeyFieldSpecified;
            }
            set
            {
                this.primaryKeyFieldSpecified = value;
            }
        }