From the following partial code listing, identify the name(s) of event-handler method(s)
that would need to be written. To what object(s) are they wired?
public class Question : System.Windows.Forms.Form
{
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.TextBox txtBxActivity;
        private System.Windows.Forms.CheckBox ckBxSwim;
        private System.Windows.Forms.CheckBox ckBxSnorkel;
        private System.Windows.Forms.TextBox txtBxResult;
              : // Colon indicates items missing.
        private void InitializeComponent()
{
          this.label1 = new System.Windows.Forms.Label();
          this.ckBxSwim = new System.Windows.Forms.CheckBox();
          this.ckBxSnorkel = new
               System.Windows.Forms. CheckBox();
          this.lstBxEvents.SelectedIndexChanged += new
               System.EventHandler
                (this. lstBxEvents_SelectedIndexChanged);