البحث عن فايل معين في الحاسبة

        private void Form1_Load(object sender, EventArgs e)
        {

            listBox1.Items.AddRange(Directory.GetDirectories("c:\\"));
         }

        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            /*
            DirectoryInfo df = new DirectoryInfo("c:\\System Volume Information");

            DirectorySecurity dSecurity = df.GetAccessControl();
            MessageBox.Show(dSecurity.ToString());
            */

            try
            {
                listBox2.Items.AddRange(Directory.GetDirectories(listBox1.SelectedItem.ToString()));
            }
            catch (UnauthorizedAccessException ioexp) { MessageBox.Show(ioexp.Message); }
            }
    }

DirectorySecurity