Add controls at runtime and handle its Click event

I am running the following code, control was made but can not handle. Why ?

    protected void Page_Load(object sender, EventArgs e)
    {
        Button Bt = new Button();
        Bt.ID = "ButtonID";                    
        Bt.Text = "Button Text";
        Bt.Click += new EventHandler(this.test);
        i.Controls.Add(Bt);
    }

    protected void test(object sender, EventArgs e)
    {
        Label1.Text = "Test";
    }