private void BtnExchange_Click(object sender, EventArgs e)
        {
            //re-load unsorted list
            DataFile();
            TxtSorted.Clear();

            ExchangeSort();
            DisplaySortedList();
        }
        private void BtnPointerShell_Click(object sender, EventArgs e)
        {
            //re-load unsorted list
            DataFile();
            TxtSorted.Clear();

            ShellSort();
            DisplayPointerSortedList();
        }
        private void DisplaySortedList()
        {
            TxtSorted.Clear();
            TxtSorted.Text  = "Home Run Leaders" + Environment.NewLine;
            TxtSorted.Text += Environment.NewLine;


            for (int i = 1; i <= n; i++)
            {
                TxtSorted.Text += names[i] + "\t" + cities[i] + "\t" + homeruns[i].ToString() + Environment.NewLine;
            }

            TxtSorted.Text += Environment.NewLine;
        }