using System.Xml.Linq;
protected void WriteXml(string path)
{
    XDocument Xdoc = new XDocument(
    new XDeclaration("1.0","utf-8","yes"),
    new XComment("Create Time:"+DateTime.Now),
    new XElement("mybook",
        new XElement("bookfir",
        new XAttribute("id",1),
        new XAttribute("name","book1"),
        new XElement("bookname","asp.net"),
        new XElement("bookprice",100)
        ),
        new XElement("booksec",
        new XAttribute("id",2),
        new XAttribute("name","book2"),
        new XElement("bookname","php"),
        new XElement("price",200)
        )
        )
    );
    Xdoc.Save(path);
}

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