private void ulke_listeleme_Click(object sender, EventArgs e)
        {
            ulke_guncelleme_ekrani frm = new ulke_guncelleme_ekrani();

            frm.Show();
            this.Hide();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            ulke_guncelleme_ekrani formkapa = new ulke_guncelleme_ekrani();

            formkapa.Close();
            guncelleme_form_ekranı form = new guncelleme_form_ekranı();

            form.Show();
            this.Hide();
        }