winform关闭窗体事件

private void Form2_FormClosing(object sender, FormClosingEventArgs e)   

{   

    DialogResult result = MessageBox.Show("你确定要关闭吗！", "提示信息", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);   

    if (result == DialogResult.OK)   

    {   

        e.Cancel = false;  //点击OK  

    }   

    else  

    {   

        e.Cancel = true;   

    }   

}