private void dgvTermini_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            var id = dgvTermini.SelectedRows[0].Cells[0].Value;
            frmTerminiDetalji frm = new frmTerminiDetalji(int.Parse(id.ToString()));

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

            frm.Show();
        }