private void dgvSponzor_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            var id = dgvSponzor.SelectedRows[0].Cells[0].Value;

            frmSponzorDetalji frm = new frmSponzorDetalji(int.Parse(id.ToString()));

            frm.Show();
        }
        private void btnDodaj_Click(object sender, EventArgs e)
        {
            frmSponzorDetalji frm = new frmSponzorDetalji();

            frm.Show();
        }