title: Pop-up window in ASP.NET `Page_Load` method
body: <p>I have a website. While the user is logged in, all reminder messages should pop up. I don't know how to code this. I've used <code>AjaxControlToolkit</code> on my page. All tools are added in the toolbox. I can't, however, drag the controls onto the page. How can I resolve these two issues?</p>