private void buttonEditAnswer_Click(object sender, EventArgs e)
        {
            int            index = listBoxAnswersI.SelectedIndex;
            FormEditAnswer form  = new FormEditAnswer(dec.GetAnswer(index));

            form.ShowDialog();
            listBoxAnswersI.DataSource = dec.GetListAnswers();
        }
        private void buttonEditAnswerII_Click(object sender, EventArgs e)
        {
            int index = listBoxAnswersII.SelectedIndex;
            var n     = decLabelII.GetAnswer(index);

            if (n != null)
            {
                FormEditAnswer form = new FormEditAnswer(decLabelII.GetAnswer(index));
                form.ShowDialog();
                listBoxAnswersII.DataSource = decLabelII.GetListAnswers();
            }
            else
            {
                MessageBox.Show("Добавьте аргумент");
            }
        }