private void GameControlForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            DialogResult dr = MessageBox.Show(
                "Opravdu chcete ukončit BasketballScoreboard? Přijdete o veškerá zadaná data.",
                "Ukončit BasketballScoreboard",
                MessageBoxButtons.YesNo,
                MessageBoxIcon.Question
                );

            if (dr == DialogResult.Yes)
            {
                connectionsManager.Disconnect();
                Environment.Exit(0);
            }
            else
            {
                e.Cancel = true;
            }
        }