private void dersListeleEkleToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Dersler dersler = new Dersler();

            YavruForm(dersler);
        }
 private void dersListeleEkleToolStripMenuItem_Click(object sender, EventArgs e)
 {
     Dersler dersler = new Dersler();
     YavruForm(dersler);
 }