第一个示例方法：

1 SqlConnection conn = new SqlConnection();

2 conn.ConnectionString = "Server=127.0.0.1;User

ID=sa;Password=fdahgdrethj31313210212121;

Database=northwind;Persist Security Info=True";

3 conn.Open();

4 SqlDataAdapter da = new SqlDataAdapter("select * from 表", conn);

5 SqlCommandBuilder thisBulder = new SqlCommandBuilder(da);

6 DataSet ds = new DataSet();

7 da.Fill(ds);

8 ds.WriteXml(@"C:temp.xml");

第二个示例方法：

1 private void WriteXmlToFile(DataSet thisDataSet)

2 {

3 if (thisDataSet == null) { return; }

4 // Create a file name to write to.

5 string filename = "myXmlDoc.xml";

6 // Create the FileStream to write with.

7 System.IO.FileStream myFileStream = new System.IO.FileStream

8 (filename, System.IO.FileMode.Create);

9 // Create an XmlTextWriter with the fileStream.

10 System.Xml.XmlTextWriter myXmlWriter =

11 new System.Xml.XmlTextWriter

(myFileStream, System.Text.Encoding.Unicode);

12 // Write to the file with the WriteXml method.

13 thisDataSet.WriteXml(myXmlWriter);

14 myXmlWriter.Close();

15 }