Using DataGridView to Show Data in a table

Selecting multiple files and show their information on a DataGridView

    public partial class Form1 : Form
    {
        private String[] selectedFiles;
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            openFileDialog1.Title = "Open a file to process";
            openFileDialog1.Multiselect = true;
            //selectable file types
            openFileDialog1.Filter = "Portable Document Format (*.pdf)|*.pdf|Text Documents(*.txt)|*.txt|Executable(*.exe)|*.exe|MPEG Layer 3 File(*.mp3)|*.mp3";
            openFileDialog1.InitialDirectory = "c:";
            DialogResult respo= openFileDialog1.ShowDialog();
            if (respo == DialogResult.OK)
            {
                selectedFiles = openFileDialog1.FileNames;
            }
            else
            {
                textBox1.Text = "No selected file!";
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            dataGridView1.Columns.Add("FileName", "File Name");
            dataGridView1.Columns.Add("FileSize", "File Size");
            dataGridView1.Columns.Add("IsSystem", "Last Accessed Time");

            

            //dataGridView1.Rows.Add(new Object[] { "A.php", "2345KB", "True" });
            //dataGridView1.Rows.Add(new Object[] { "CV.doc", "3543KB", "False" });
            //dataGridView1.Rows.Add(new Object[] { "cmd.exe", "35763KB", "True" });
            foreach (String file in selectedFiles)
            {
                FileInfo fObj = new FileInfo(file);
                String fileName;
                try
                {
                    fileName = file.Substring(file.LastIndexOf('\\') + 1);
                }catch(ArgumentOutOfRangeException ex)
                {
                    fileName = file;
                }

                long leng = fObj.Length;
                bool isReadOnly = fObj.IsReadOnly;
                DateTime lwt = fObj.LastWriteTime;
                String lastAccess = lwt.ToString();

                dataGridView1.Rows.Add(new Object[]{fileName,leng,lastAccess});

                Console.WriteLine(fileName);
            }
        }