C# .NET Generate Excel (Windows 7 and Office Excel 2003 , Excel 2007 , Excel 2010)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using Excel = Microsoft.Office.Interop.Excel; 

namespace ExcelC
{
    public partial class frmExcel : Form
    {
        public frmExcel()
        {
            InitializeComponent();
        }

        private void btnExcel_Click(object sender, EventArgs e)
        {
            Excel.Application xlApp;
            Excel.Workbook xlWorkBook;
            Excel.Worksheet xlWorkSheet;
            object mis = Type.Missing;

            string strFileName = "C:\\ExcelC\\Xls\\GenExcel.xls";

            xlApp = new Excel.ApplicationClass();
            //xlApp = new Excel.Application();
            xlWorkBook = xlApp.Workbooks.Add(mis);
     
            //xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.Add(mis, mis, mis, mis); /*** for Add New Sheet ***/
            xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
            xlWorkSheet.Name = "My Sheet";
            xlWorkSheet.Cells[1, 1] = "www.ThaiCreate.Com";
            xlWorkSheet.Cells[2, 1] = "Mr.Weerachai Nukitram";

            xlWorkBook.SaveAs(strFileName,
                mis, mis, mis, mis, mis, Excel.XlSaveAsAccessMode.xlExclusive, mis, mis, mis, mis, mis);
            xlWorkBook.Close(true, mis, mis);
            xlApp.Quit();

            System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp);
            System.Runtime.InteropServices.Marshal.ReleaseComObject(xlWorkBook);
            System.Runtime.InteropServices.Marshal.ReleaseComObject(xlWorkSheet);

            xlApp = null;
            xlWorkBook = null;
            xlWorkSheet = null;
            GC.Collect();

            MessageBox.Show("Generate Successfully");

        }

    }
}