C#提示窗口

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    DialogResult result= MessageBox.Show("您是否要关闭此窗口?", "提示窗口", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
    if(result==DialogResult.Yes)
    {
        e.Cancel = false;
    }
    else
    {
        e.Cancel = true;
    }

}