Infinite scrolling using jQuery Ajax and ASP.NET MVC
Web applications such as Facebook and Twitter use a technique known as infinite scrolling or endless scrolling wherein data is loaded on the fly when a user scrolls to the bottom of a web page. There are many jQuery plugins that help you enable such a feature in your web application. However, if you wish to avoid any third-party dependency or have some specific needs, you can add your own infinite scrolling with a few lines of jQuery code and ASP.NET MVC. This article tells you how that can be accomplished.
http://www.binaryintellect.net/articles/6d19edd9-7582-4caf-b254-73deca44ecfb.aspx