How to open and read XML file in C#

using System;
using System.Data;
using System.Xml;
using System.IO;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load("d:\\product.xml");
            XmlNodeList nodeList = xmlDoc.DocumentElement.SelectNodes("/Table/Product");
            string proID = "", proName = "", price="";
            foreach (XmlNode node in nodeList)
            {
                proID = node.SelectSingleNode("Product_id").InnerText;
                proName = node.SelectSingleNode("Product_name").InnerText;
                price = node.SelectSingleNode("Product_price").InnerText;
                MessageBox.Show(proID + " " + proName + " " + price);
            }
        }
    }
}