private void btnDodaj_Click(object sender, EventArgs e)
        {
            frmNoviScanIspitaBrojIndeks frm = new frmNoviScanIspitaBrojIndeks(student);

            frm.ShowDialog();
            UcitajSkenove();
        }
        private void dgvSken_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            var sken = dgvSken.Rows[e.RowIndex].DataBoundItem as StudentiIspitiScan;

            if (e.ColumnIndex == 5)
            {
                if (MessageBox.Show("Da li ste sigurni?", "?", MessageBoxButtons.YesNo, MessageBoxIcon.Warning)
                    == DialogResult.Yes)
                {
                    _baza.StudentiIspitiScan.Remove(sken);
                    _baza.SaveChanges();
                    UcitajSkenove();
                }
            }
            else
            {
                frmNoviScanIspitaBrojIndeks frm = new frmNoviScanIspitaBrojIndeks(sken);
                frm.ShowDialog();
            }
        }