public static int Open()
{
if (form == null)
{
form = new SettingForm();
form.Closing += Closing;
form.Show();
return(1);
}
else
{
form.Activate();
form.Show();
return(0);
}
}
private static void Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
form = null;
}