DataSetÐòÁл¯Êä³öµ½XML(²¢Ö¸¶¨Êä³öXML±ê×¼)

 public partial class Form1 : Form
    {
        DataSet ds = new DataSet();
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {        
            string str = ds.GetXml();
            SaveToXml(str);
        }
        /// <summary>
        /// Êä³öÖ¸¶¨Îļþµ½Ö¸¶¨Îļþ
        /// </summary>
        /// <param name="str"></param>
        private void SaveToXml(string str)
        { 
            string path = "d:\\Customers.xml";
            FileInfo fi = new FileInfo(path);
            if (!fi.Exists)
            {              
                using (StreamWriter sw = fi.CreateText())
                {