c#传值

父窗体按钮

private void button1_Click(object sender, System.EventArgs e)
  {
   Form2 f2=new Form2();
   f2.ShowDialog(this);
  }

子窗体确定按钮

private void button1_Click(object sender, System.EventArgs e)
  {
   Form1 f1 = (Form1)this.Owner;
   f1.label1.Text=textBox1.Text;
  } 

lable1要设置为public的