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设置Form1上的Label的Modifiers为true
Form1:
private void button1_Click(object sender, EventArgs e)
{
Form2 frm = new Form2();
frm.Tag = this;
frm.ShowDialog();
}
Form2:
private void button1_Click(object sender, EventArgs e)
{
Form1 frm = (Form1)this.Tag;
frm.label1.Text = this.textBox1.Text;
}