button click event on code behind

Hi,

how can I assign a method to a button defined in the code behind?

my code:

Button btn = new Button();
                    btn.CommandArgument = i.ToString();
                    btn.ID = "btn" + i.ToString();
                    btn.Text = "rimuovi";
                    btn.Click=;

I want to reach the protected method deleteLotto

Thanks in advance