protected void Button3_Click(object sender, EventArgs e) { StackPool <Person> pStackPool = new StackPool <Person>(); pStackPool.Store(new Person()); pStackPool.Store(new Person()); Person p1 = pStackPool.Fetch(); Person p2 = pStackPool.Fetch(); this.TextBox1.Text += string.Format($"\r\nThe Stack class implements a Last in First Out data structure. Push() and Pop()"); }