private void btnConferma_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("Confermi la cancellazione dell'evento del " + dataEvento[listaEventi.SelectedIndex].ToShortDateString() + "?", "Conferma cancellazione", MessageBoxButtons.YesNo) == System.Windows.Forms.DialogResult.Yes)
            {
                OdbcConnection conn = new OdbcConnection(ConfigurationManager.ConnectionStrings["con"].ConnectionString);
                conn.Open();
                OdbcCommand cm = new OdbcCommand();
                cm.CommandText = "DELETE FROM SerataDanzante WHERE IDSerata=" + idEvento[listaEventi.SelectedIndex];
                cm.Connection  = conn;
                if (cm.ExecuteNonQuery() > 0)
                {
                    MessageBox.Show("Evento cancellato");
                }
                conn.Close();

                CaricaEventi.RunWorkerAsync();
            }
        }
 public CancellaEvento()
 {
     InitializeComponent();
     CaricaEventi.RunWorkerAsync();
 }