private void pictureBox2_Click(object sender, EventArgs e)
        {
            FrmOgrenci frm = new FrmOgrenci();

            frm.Show();
            this.Hide();
        }
        private void btn_ogrMenu_Click(object sender, EventArgs e)
        {
            FrmOgrenci form = new FrmOgrenci();

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