how to find last item index in datalist

using System.Web.UI.WebControls;

namespace Dummy
{
    public static class DatalistExtension
    {
        public static DataListItem GetLastItem(this DataList list)
        {
            if (list.HasItems())
            {
                return list.Items[list.Items.Count - 1];
            }

            return null;
        }
     
        public static bool HasItems(this DataList list)
        {
            return list.Items.Count > 0;
        }
    }
}

DataList dl = new DataList();
dl.DataSource = new List<string>() { "One", "Two" };
dl.DataBind();

DataListItem dli = dl.GetLastItem();
</string>

int count = DataList1.Items.Count - 1;