Winform将一个窗体显示在另一个窗体中

1 private void ShowForm(Form Indexform)
2 {
3   Form1 form1 = new Form1();
4   form1 .TopLevel = false;
5   form1 .Parent = Indexform;
6   form1 .BringToFront();
7   form1.Show();
8 }