private void lstMonths_SelectedIndexChanged(object sender, EventArgs e)
        {
            int          indice = this.lstMonths.SelectedIndex;
            Class03Meses mes    = this.meses[indice];

            this.textBox1.Text = mes.Meses;
            this.textBox2.Text = mes.Maxima.ToString();
            this.textBox3.Text = mes.Minima.ToString();
            this.textBox4.Text = mes.GetMedia().ToString();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            this.meses.Clear();
            this.lstMonths.Items.Clear();
            DateTime fecha = DateTime.Parse("01/01/2020");
            Random   rnd   = new Random();

            for (int i = 1; i <= 12; i++)
            {
                int    max = rnd.Next(10, 40);
                int    min = rnd.Next(-20, 15);
                String mes = fecha.ToString("MMMM");
                fecha = fecha.AddMonths(1);
                Class03Meses meses = new Class03Meses(mes, max, min);
                this.lstMonths.Items.Add(meses.Meses);
                this.meses.Add(meses);
            }
        }