EXCEL file read and write using C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.OleDb;
using System.Data;
 
namespace WebAppExcelLinqTester
{
  public partial class _Default : System.Web.UI.Page
  {
    protected void Page_Load(object sender, EventArgs e)
    {
 
    }
 
    protected void GridView1_Load(object sender, EventArgs e)
    {
      string filename = @"C:\Temp\test.xls";
 
      string connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" +
                      "Data Source=" + filename + ";" +
                      "Extended Properties=Excel 8.0;";
 
 
      OleDbDataAdapter dataAdapter = new OleDbDataAdapter("SELECT * FROM [Sheet1$]", connectionString);
 
      DataSet myDataSet = new DataSet();
 
      dataAdapter.Fill(myDataSet, "QuarterTimes");
 
      DataTable dataTable = myDataSet.Tables["QuarterTimes"];
 
      //var dummy = from t in dataTable.AsEnumerable() select t;
      //foreach (var r in dummy)
      //{
      //  try
      //  {
      //    string s = r.Field<string>("Vehicle");
      //    double? Year = r.Field<double?>("Year");
      //    double? bhp = r.Field<double?>("BHP");
      //    double? Seconds = r.Field<double?>("1/4 Mile Seconds");
      //    double? MPH = r.Field<double?>("1/4 Mile MPH");
      //  }
      //  catch (Exception ex)
      //  {
      //    string x = ex.Message;
      //  }
      //}
 
      var query = from r in dataTable.AsEnumerable()
                  select new
                  {
                    Vehicle = r.Field<string>("Vehicle"),
                    Year = r.Field<double?>("Year"),
                    BHP = r.Field<double?>("BHP"),
                    Seconds = r.Field<double?>("1/4 Mile Seconds"),
                    MPH = r.Field<double?>("1/4 Mile MPH")
                  };
      this.GridView1.DataSource = query;
//this.GridView1.DataSource = query.Where(v => v.Vehicle.Contains("Harley"));
      this.GridView1.DataBind();
    }
  }
}
                                              

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