BrowserSelect.frm_settings.frm_settings_FormClosing C# (CSharp) 메소드

        private void frm_settings_FormClosing(object sender, FormClosingEventArgs e)
        {
            // alert user of unsaved changes
            if (btn_apply.Enabled)
            {
                var window = MessageBox.Show("You have unsaved changes, are you sure you want to close without saving ?",
                    "Unsaved Changes", MessageBoxButtons.YesNo);
                if (window == DialogResult.No) e.Cancel = true;
                else e.Cancel = false;
            }
        }