关于登陆窗口的关闭、传值

static class Program
    {
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Login frm = new Login();
            if (frm.ShowDialog() == DialogResult.OK)
            {
                 Application.Run(new Main(frm.flag));
            }
        }
    }

 public partial class Login : Form
    {
        public int flag = 0;
        public Login()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {  
            this.DialogResult = DialogResult.OK;
            flag =1;
            this.Close();
        }
    }

 public partial class Main : Form
    { 
        public Main(int value)
        {
            InitializeComponent();
        }
    }