ASP.net从数据库中取出数据添加到xml文件中的方法

当从数据库里取出数据填充到DataTable时，若使用dt.WriteXml(路径)读出的结果是

<DataTable>

<table>

.

.

</table>

<DataTable>

只是将DataTable直接转换成xml，

应该使用以下的方法:

XElement xmlbookstore = new XElement("bookstore");

                for (int i = 0; i < dt.Rows.Count; i++)

                     {

                XElement xmlbook = new XElement("book");

                XElement xmltitle = new XElement("title",dt.Rows[i]["title"].ToString());

               XElementxmlauthor=newXElement("author",dt.Rows[i]["author"].ToString());

                XElement xmlyear = new XElement("year", dt.Rows[i]["year"].ToString());

                XElement xmlprice = new XElement("price", dt.Rows[i]["price"].ToString());

                xmlbook.Add(xmltitle);

                xmlbook.Add(xmlauthor);

                xmlbook.Add(xmlyear);

                xmlbook.Add(xmlprice);

                xmlbookstore.Add(xmlbook);

                     }

                FileStream stream = File.OpenWrite(Server.MapPath("a.xml"));

                StreamWriter writer = new StreamWriter(stream);

                writer.Write(xmlbookstore.ToString());

                writer.Flush();

                writer.Dispose();