error when i try to not exit with program when i press button no in messagebox

[C# Programming]

End Google Ads 201810 - BS.net 01 --> hi

i have a program in c# that when i press button exit it appears
a message box that tell you if you want to exit from the program or not.

But if you press No the program make exit.

private void btnLogout_Click(object sender, EventArgs e)
{
if (MessageBox.Show("are you sure?you want to exit?;","", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
{
Application.Exit();
}
}