private void btnNovo_Click(object sender, EventArgs e)
        {
            this.comando = "inserir";
            frmExamesAreasManter frmAreas = new frmExamesAreasManter(this.comando, 0);

            frmAreas.ShowDialog();
            AtualizarTabela();
        }
        private void btnEditar_Click(object sender, EventArgs e)
        {
            int idArea;

            this.comando = "editar";
            try
            {
                idArea = Convert.ToInt32(dgvExamesAreas.CurrentRow.Cells[0].Value);
                frmExamesAreasManter frmAreas = new frmExamesAreasManter(this.comando, idArea);
                frmAreas.ShowDialog();
                AtualizarTabela();
            }
            catch (Exception)
            {
                MessageBox.Show("Selecione um item da tabela");
            }
        }