.net Button按钮提示 确认是否删除

protected void Page_Load(object sender, EventArgs e)
    {
        Button2.Attributes.Add("onclick", "return confirm('确定要删除所有积分记录吗？');");

    }

    protected void Button2_Click(object sender, EventArgs e)
    {

        Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "", "alert('删除ok!')", true);
        
    }