在c#的WinForm中，如何把listBox1中选择的多项传到listBox2中或点击按钮全部传到listBox2中

Answer 1

        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            listBox2.Items.Add(listBox1.SelectedItem);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            listBox2.Items.Clear();
            foreach (object o in listBox1.Items)
            {
                listBox2.Items.Add(o);
            }
        }