//private sifreleme sif;

        public anaEkran()
        {
            InitializeComponent();
            ge = new girisEkranı(this);
            panel1.Controls.Add(ge);
            ge.Show();
        }
        public void CikisYap()
        {
            k = null;
            //sif = null;
            ge.Close();
            me.Close();
            //ol.Close();
            //du.Close();
            panel1.Controls.Clear();

            ge = new girisEkranı(this);
            panel1.Controls.Add(ge);
            ge.Show();
        }