---

private void button1_Click(object sender, EventArgs e)
{
    Random rnd = new Random();

    listBox1.Items.Clear();

    for (int i = 0; i < mas.Length; i++)
    {
        mas[i] = rnd.Next(-33, 67);

        listBox1.Items.Add((i + 1) + ") " + mas[i]);
    }
}

private void button2_Click(object sender, EventArgs e)

{

    listBox2.Items.Clear();

    int min = 67;

    for (int i = 0; i < mas.Length; i++)

    {

        if (mas[i] % 2 != 0)

        {

            if (mas[i] < min)

            {

                min = mas[i];

            }

        }

    }

    listBox2.Items.Add("Наименьший нечетный элемент: " + min);