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private void buttonShow_Click(object sender, EventArgs e)
{
Form2 form2 = new Form2();
form2.Show();
}
private void buttonAdd_Click(object sender, EventArgs e)
{
Form1 form1 = new Form1();
form1.listBox1.Items.Add(listBox2.SelectedItem);
//form1.Show(); //加这句可以显示出来,但不是我想要的效果
//form1.Refresh();
}