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void Button1Click(object sender, EventArgs e)
{

string puffer = textBox1.Text; 

XmlWriterSettings settings = new XmlWriterSettings();
settings.Indent = true;
settings.IndentChars = " "; 

XmlWriter writer = XmlWriter.Create("Personen.xml", settings);
writer.WriteStartDocument();
writer.WriteStartElement("Personen");
writer.WriteComment("Die Datei wurde mit XmlWriter erzeugt");
writer.WriteStartElement("Person");
writer.WriteElementString("Zuname", puffer);
writer.WriteElementString("Vorname", "Peter");
writer.WriteStartElement("Adresse");
writer.WriteAttributeString("Ort", "Eifel");
writer.WriteAttributeString("Strasse", "Am Wald 1");
writer.WriteValue("Germany");
writer.WriteEndElement();
writer.WriteEndElement();
writer.WriteEndElement();
writer.WriteEndDocument();
writer.Close();

}                    

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<?xml version="1.0" encoding="utf-8" ?> 
- <Personen>
- <!-- Die Datei wurde mit XmlWriter erzeugt
--> 
- <Person>
<Zuname>miu</Zuname> 
<Vorname>Peter</Vorname> 
<Adresse Ort="Eifel" Strasse="Am Wald 1">Germany</Adresse> 
</Person>
</Personen>