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

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

            frm.Show();
        }