Read Excel file in C#

protected void BtnReadExcel_Click(object sender, EventArgs e)

        {

            try

            {

              OleDbConnection con = new OleDbConnection("
                                                Provider=Microsoft.Jet.OLEDB.4.0;
                                                Data Source=" + Server.MapPath("TestExcel.xlsx") + ";
                                                Extended Properties='Excel 8.0;HDR=Yes;'" 
                                               );

                OleDbDataAdapter da = new OleDbDataAdapter("select * from [Sheet1$]",
                                                                                 con);

                DataSet ds = new DataSet();

                da.Fill(ds);

            }

            catch (Exception ex)

            {

                throw;

            }

        }