static void Main()
        {
            conn = new SqlCeConnection();
            conn.ConnectionString = @"Data Source='Database1.sdf'";
            conn.Open();
            Application.SetCompatibleTextRenderingDefault(false);
            Main_fm mainForm = new Main_fm(conn);
            Application.EnableVisualStyles();

            Application.Run(mainForm);
            mainForm.FormClosing += form_closing;
        }
        static void Main()
        {
            conn = new SqlCeConnection();
            conn.ConnectionString = @"Data Source='Database1.sdf'";
            conn.Open();
            Application.SetCompatibleTextRenderingDefault(false);
            Main_fm mainForm = new Main_fm(conn);

            Application.EnableVisualStyles();

            Application.Run(mainForm);
            mainForm.FormClosing += form_closing;
        }