//DataTable DateSet 都可以用來讀取xml數據和寫入xml數據protected voidButton1_Click(object sender, EventArgs e){  DataTabledt = new DataTable("Employee");  DataColumndcID = new DataColumn("ID", typeof(string));  DataColumndcName = new DataColumn("NAME", typeof(string));  DataColumndcAGE = new DataColumn("AGE", typeof(string));  DataColumndcDEPT = new DataColumn("DEPT", typeof(string));  dt.Columns.AddRange(new DataColumn[] {dcID, dcName, dcAGE, dcDEPT });  DataRowdr = dt.NewRow();  dr["ID"]= "3";  dr["NAME"]= "chen";  dr["AGE"]= "21";  dr["DEPT"]= "技術部";  dt.Rows.Add(dr);  DataSetds2 = new DataSet();  ds2.Tables.Add(dt);  DataSetds = new DataSet();  ds.ReadXml(Server.MapPath("Employee.xml"));  ds.Merge(ds2);//合并數據  ds.WriteXml(Server.MapPath("Employee.xml"));  Page.ClientScript.RegisterStartupScript(GetType(), "", "alert('寫入成功')",true);}protected voidButton2_Click(object sender, EventArgs e){  DataSetds = new DataSet();  ds.ReadXml(Server.MapPath("Employee.xml"));  GridView1.DataSource = ds;  GridView1.DataBind();}