private void btnIniciar_Click(object sender, EventArgs e)
        {
            Dominio.Configuracao configuracao = new Dominio.Configuracao();
            if (configuracao.IsValido())
            {
                int idContest = (int)cmbContest.SelectedValue;
                if (idContest > 0)
                {
                    _Questoes = _QuestaoRepositorio.Questoes(idContest);
                    foreach (var item in _Questoes)
                    {
                        _QuestaoRepositorio.DownloadQuestao(item);
                    }

                    lstProblemas.DataSource = _Questoes;

                    cmbContest.Enabled = false;
                    timer2.Enabled = true;
                }
            }
        }