DataSet ds = new DataSet();
        DataSet ds1 = new DataSet();
        DataTable dt = new DataTable("books");

        ds.ReadXml(Server.MapPath("books.xml"));
        for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
        {
            string bid = Convert.ToString(ds.Tables[0].Rows[i]["bid"].ToString());
            if (Convert.ToString(TextBox1.Text.ToLower()) == bid.ToLower())
            {
                int col = ds.Tables[0].Columns.Count;
                ds1.Tables.Add(dt);
                dr = ds1.Tables["books"].NewRow();
                for (int j = 0; j < col; j++)
                {
                    string colname = ds.Tables[0].Columns[j].ColumnName.ToString();
                    dt.Columns.Add(colname, typeof(string));
                    dr[colname] = Convert.ToString(ds.Tables[0].Rows[i][colname].ToString());
                }
                dt.Rows.Add(dr);
                XmlDataDocument doc = new XmlDataDocument(ds1);
                XslCompiledTransform transform = new XslCompiledTransform();
                transform.Load(Server.MapPath("xsl1.xsl"));
                XmlTextWriter writer = new XmlTextWriter(Server.MapPath("mybooks.xml"), Encoding.UTF8);
                writer.Formatting = Formatting.Indented;
                writer.Indentation = 4;
                transform.Transform(doc, null, writer);
            }
        }