public void Add(Swimmer sw)
        {
            DataRow row = dTable.NewRow();

            row["Frname"] = sw.getFrname();
            row[1]        = sw.getLName();
            row[2]        = sw.getAge(); //This one is an integer
            dTable.Rows.Add(row);
            dTable.AcceptChanges();
        }
 //-----
 public void Add(Swimmer sw)
 {
     this.Items.Add(sw.getName() +
                    "\t" + sw.getAge().ToString());
 }