private void Form1_Load(object sender, System.EventArgs e)
        {
            const string xmlns = "http://www.atmarkit.co.jp/xmlns/sample/person";
            XmlDocument document = new XmlDocument();

            XmlDeclaration xmlDecl = document.CreateXmlDeclaration("1.0", "UTF-8", null);
            document.AppendChild(xmlDecl);

            XmlElement rootElement = document.CreateElement("person", "record", xmlns);
            document.AppendChild(rootElement);

            XmlAttribute idAttr = document.CreateAttribute("id");
            idAttr.Value = "0011";
            rootElement.Attributes.Append(idAttr);

            XmlElement nameElement = document.CreateElement("person", "name", xmlns);
            rootElement.AppendChild(nameElement);

            XmlText nameText = document.CreateTextNode("山田一郎");
            nameElement.AppendChild(nameText);

            XmlElement ageElement = document.CreateElement("person", "age", xmlns);
            rootElement.AppendChild(ageElement);
            ageElement.InnerText = "17";

            XmlElement addressElement = document.CreateElement("person", "address", xmlns);
            rootElement.AppendChild(addressElement);
            addressElement.InnerXml = "<country:code xmlns:country="
                + "\"http://www.atmarkit.co.jp/xmlns/sample/country\">jp</country:code>"
                + "東京都杉並区1-2-3";

            XmlComment comment1  = document.CreateComment("サンプルプログラムの出力");
            rootElement.InsertBefore(comment1, nameElement);

            XmlComment comment2 = document.CreateComment("個人情報");
            rootElement.InsertAfter(comment2, nameElement);

            document.Save(@"c:\sample.xml");
        }