File_properties_write_in_Excel

using System;
using System.Windows.Forms;
using Excel = Microsoft.Office.Interop.Excel;
using System.IO;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
    public Form1()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        string[][] strFile = new string[][];
        int arrRow=0;
        OpenFileDialog dialog = new OpenFileDialog {
            Filter = "Файлы Excel |*.xlsx"
        };
        if (dialog.ShowDialog() == DialogResult.OK){
            Excel.Application app = new Excel.Application();
            app.Workbooks.Open(dialog.FileName);
            Excel.Workbook book = app.ActiveWorkbook;
            Excel.Worksheet sheet = (Excel.Worksheet)book.Worksheets[1];
            DirectoryInfo dir = new DirectoryInfo(@"F:\");
            foreach(FileInfo files in dir.GetFiles()){
                sheet.Cells[arrRow, 1] = files.Name;
                sheet.Cells[arrRow, 2] = files.Length;
                arrRow++;
            }
            book.Save();
            app.Quit();
        }
    }
}