private void tsmiCarLeaving_Click(object sender, EventArgs e)
        {
            string registrationNumber;

            if (overview != null && overview.Count > 0)
            {
                int selectedRowIndex = dgvOverview.CurrentCell.RowIndex;

                if (dgvOverview.Rows[selectedRowIndex].Cells[4].Value.ToString() != "")
                {
                    MessageBox.Show("That car already left!", "Car left!", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                }
                else
                {
                    registrationNumber = dgvOverview.Rows[selectedRowIndex].Cells["registrationNumber"].Value.ToString();

                    FormCarControl FormCarControl = new FormCarControl(overview[selectedRowIndex], 2);


                    if (FormCarControl.ShowDialog() == DialogResult.OK)
                    {
                        dgvOverview.Rows[selectedRowIndex].Cells["timeLeft"].Value = FormCarControl.TimeLeft;

                        overview[selectedRowIndex].ParkedCar.TimeLeft = FormCarControl.TimeLeft;
                        overview[selectedRowIndex].ParkedCar.Price = FormCarControl.Price;

                        dgvOverview.Rows[selectedRowIndex].Cells["price"].Value = FormCarControl.Price + " din.";

                        AlterCarLeft(overview[selectedRowIndex].ParkedCar);
                    }
                }
            }
            else
            {
                MessageBox.Show("First add some cars!", "Add car!", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
            }
        }