Simple ASP.NET Endless Pagination

[m333]

I'm looking to implement some simple endless pagination for a comments section, similar to Youtube comments where you click Show More at the bottom and it loads a few more comments but maintains state for the previous ones.I think I can do it in an UpdatePanel with a ListView with the Ajax control toolkit and a bit of Jquery, but just need some guidance. I was thinking of displaying the first 4 items that come back and databind them to my ListView, the ListView would be wrapped in a UpdatePanel with a "Show More" button, when the button is clicked it would add 4 more to the datasource and rebind the ListView, but this would not smoothly add the 4 comments tot he bottom, rather the ListView section would refresh to show the new comments.Is there a smoother/better way of doing this? I am using Webforms.