Get Random listBox Item to String C#

Random random = new Random();
            int randomNumber = random.Next(1, listBox1.Items.Count);
            listBox1.Select();
            listBox1.SelectedItem = listBox1.Items[randomNumber];
            var str = listBox1.SelectedItem;
          // MessageBox.Show(str.ToString());
     //or
    string bass = str.ToString();
//SOURCE: https://stackoverflow.com/questions/11771050/how-do-i-get-a-random-item-from-a-listbox-then-compare-it-in-c
//Answered by Habib