private void btnSinifElave_Click_1(object sender, EventArgs e)
        {
            FrmSinifIsler form = new FrmSinifIsler(new Entities.Sinif());

            form.ShowDialog();
            if (form.YaddaSaxlanildi4)
            {
                Listele();
            }
        }
        private void btnSinifEdit_Click_1(object sender, EventArgs e)
        {
            Entities.Sinif sinifEntity = (Entities.Sinif)gridSinif.GetFocusedRow();
            FrmSinifIsler  form        = new FrmSinifIsler(sinifEntity);

            form.ShowDialog();
            if (form.YaddaSaxlanildi4)
            {
                Listele();
            }
        }