Nguyễn phúc minh phầN 1 DataProvider

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using System.Xml;

using System.Xml.Linq;

{

public partial class Form1 : Form

public Form1()

{

InitializeComponent();

string path = "D:\\Test.xml";

private void Loaddata()

{
XmlDataDocument xmlsach = new XmlDataDocument();

xmlsach.DataSet.ReadXml(Application.StartupPath + "\\Demo.xml");

dtXML.DataSource = xmlsach.DataSet;

dtXML.DataMember = "student";

}

private void Form1_Load(object sender, EventArgs e)

Loaddata();

}
private void btnThem_Click(object sender, EventArgs e)

{

string day = DateTime.Now.Day.ToString();

string year = DateTime.Now.Year.ToString();

string hour = DateTime.Now.Hour.ToString();

string minute = DateTime.Now.Minute.ToString();

string second = DateTime.Now.Second.ToString();

long id = long.Parse(day + month + year + hour + minute + second);

try

{

XDocument testXML = XDocument.Load(path);

new XElement("Name", txtTen.Text),

new XElement("Age", txtTuoi.Text));
var lastStudent = testXML.Descendants("Student").Last();

long newID = Convert.ToInt64(lastStudent.Attribute("ID").Value);

newStudent.SetAttributeValue("ID", id);
testXML.Element("Students").Add(newStudent);

testXML.Save(path);

Loaddata();

}

catch (Exception err)

MessageBox.Show(err.Message);

}

}
private void btnSua_Click(object sender, EventArgs e)

try

XDocument testXML = XDocument.Load(path);

XElement cStudent = testXML.Descendants("Student").Where(c => c.Attribute("ID").Value.Equals(txtTuoi.Text)).FirstOrDefault();

cStudent.Element("Name").Value = txtTen.Text;

cStudent.Element("Age").Value = txtTuoi.Text;

testXML.Save(path);

Loaddata();

}

catch (Exception err)

MessageBox.Show(err.Message);

}

}

}