How to Read Excel File in List and Display in Data gridview

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using System.Runtime.InteropServices;

using Excel = Microsoft.Office.Interop.Excel;

namespace read_excel

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }



        private void button1_Click(object sender, EventArgs e)

        {

            Excel.Application xlApp;

            Excel.Workbook xlWorkBook;

            Excel.Worksheet xlWorkSheet;

            Excel.Range range;



            int rw = 0;

            int cl = 1;



            xlApp = new Excel.Application();

            xlWorkBook = xlApp.Workbooks.Open(@"C:\images\docs\salman.xls", 0, true, 5, "", "", true, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, 1, 0);

            xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);



            range = xlWorkSheet.UsedRange;

            rw = range.Rows.Count;

            List<student> li = new List<student>();

            //

            //data read code...............................................

            for (int i = 2; i <= rw; i++)

            {

                student s = new student();

                s.id=(int)(range.Cells[i,cl] as Excel.Range).Value;

                s.Name = (string)(range.Cells[i, ++cl] as Excel.Range).Value;

                s.Marks = (int)(range.Cells[i, ++cl] as Excel.Range).Value;

                cl = 1;

                li.Add(s);

            }



            //data read code...............................................



            //

            xlWorkBook.Close(true, null, null);

            xlApp.Quit();



            Marshal.ReleaseComObject(xlWorkSheet);

            Marshal.ReleaseComObject(xlWorkBook);

            Marshal.ReleaseComObject(xlApp);



            dataGridView1.DataSource = li;



        }

    }

}

-----------------------------------------------------------------------------------------------------------

class student

    {

        public int id { get; set; }

        public string Name { get; set; }

        public int Marks { get; set; }

    }