点击关闭按钮弹出对话框确认是否关闭窗体

private void main_FormClosing(object sender, FormClosingEventArgs e)
{
if (e.CloseReason == CloseReason.UserClosing)//当用户点击窗体右上角X按钮或(Alt + F4)时 发生

{
if ( MessageBox.Show("确定退出？", "退出程序", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning) == DialogResult.OK)
{
//count += 1;
// e.Cancel = true;

Application.Exit();

}
}
}