How to filter in a XML file

using System;

using System.Data;

using System.Windows.Forms;

using System.Xml;



namespace WindowsApplication1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }



        private void button1_Click(object sender, EventArgs e)

        {

            XmlReader xmlFile ;

            xmlFile = XmlReader.Create("Product.xml", new XmlReaderSettings());

            DataSet ds = new DataSet();

            DataView dv ;

            ds.ReadXml(xmlFile);

            dv = new DataView(ds.Tables[0], "Product_price > = 3000", "Product_Name", DataViewRowState.CurrentRows);

            dv.ToTable().WriteXml("Result.xml");

            MessageBox.Show ("Done");

        }

    }

}