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public Form2 f2;
private void button1_Click(object sender, EventArgs e)
{
f2 = new Form2();
f2.Show();//显示窗体
}
private void button2_Click(object sender, EventArgs e)
{
f2.Close();//关闭窗体
}
private void button1_Click(object sender, EventArgs e)
{
this.Close();
}