//Do they really want to exit program?
 
 private void btnQuit_Click(object sender, EventArgs e)
        {
            //---create a button as a dialogresult object so we can tell what they clicked
            DialogResult button1 = MessageBox.Show(
                "Are you sure you want to exit?","System Message", 
                MessageBoxButtons.YesNo, MessageBoxIcon.Question);

            if (button1 == DialogResult.No)
            {
                DialogResult button2 = MessageBox.Show(
               "Then make up your mind!", "System Message",
               MessageBoxButtons.OK, MessageBoxIcon.Exclamation);

            }
            else
            {
                this.Close();            //close the form
            }
        }