Sorting in XML using C#

Please check like this
btnReader_Click show the original result of Xml file
btnArrange_Click show the descending order





protected void btnReader_Click(object sender, EventArgs e)
{
string myXMLfile = @"E:\jlpt3.xml";
DataSet ds = new DataSet();
// Create new FileStream with which to read the schema.
System.IO.FileStream fsReadXml = new System.IO.FileStream
(myXMLfile, System.IO.FileMode.Open);

ds.ReadXml(fsReadXml);
GridView1.DataSource = ds;
GridView1.DataBind();


fsReadXml.Close();


}
//////////////////////////////////////////////////////////////////////////////////////////////////////////
protected void btnArrange_Click(object sender, EventArgs e)
{
string myXMLfile = @"E:\jlpt3.xml";
DataSet ds = new DataSet();
System.IO.FileStream fsReadXml = new System.IO.FileStream
(myXMLfile, System.IO.FileMode.Open);

ds.ReadXml(fsReadXml);
DataView dv = new DataView(ds.Tables[0]);
DataTable dt = dv.Table;

dt.Columns[0].ColumnName = "kana";
dt.Columns[1].ColumnName = "kanji";
dt.Columns[2].ColumnName = "type";
dt.Columns[3].ColumnName = "english";

dv.Sort = dt.Columns[3].ColumnName;

// append "DESC" to the sort field name in order to
// sort descending
dv.Sort += " DESC";


GridView1.DataSource = dv;
GridView1.DataBind();


fsReadXml.Close();


}