Page refresh to update data

Question

Hi Guys,
I am using ASP.NET with C# to create a web page that pulls a list of data from a database and displays it in an HTML table on a web page. However the list is bigger than the page so I want it to refresh every 20 seconds or so and show the next page until it gets to the last page then go back to the start.
What is the easiest way to achieve this??
Thanks in advance for any help.
Chris