奇怪的异步调用，那位高手能帮忙看一下？

delegate void SetStr(string s);
private void SetText(string name)
        {
           txtResult.Text = name;
        }
private void btnFind_Click(object sender, EventArgs e)
        {
            Thread th = new Thread(new ThreadStart(FindFile));
            th.Start();
         }

private void FindFile()
        {
            string[] m = Directory.GetDirectories(@"c:\\", txtFile.Text.Trim(), SearchOption.AllDirectories);
string s = "test";
            Invoke(new SetStr(SetText), s);
          }
以上可以运行在vs 2005 下;
但是下面的报错：
delegate void SetStr(string[] s);
private void SetText(string[] name)
        {
           for (int i = 0; i < name.Length; i++)
            {
                txtResult.Text = txtResult.Text + name[i] + "\n";
            }
        }
private void btnFind_Click(object sender, EventArgs e)
        {
            Thread th = new Thread(new ThreadStart(FindFile));
            th.Start();
         }