Threading problem with calling a function

private void Go_Click(object sender, EventArgs e)
        {
            drives = System.Environment.GetLogicalDrives();
            Thread t = new Thread(() => Engine(drives));
            t.Start();
        }
        private void Engine(string[] path)
        {
            foreach (string s in path)
            {
                try
                {
                    foreach (string f in System.IO.Directory.GetFiles(s))
                        list.Items.Add(f);
                    Engine(System.IO.Directory.GetDirectories(s));
                }
                catch { continue; }
            }
        }