sharepoint 2010: Duplicate list items created during page refresh

Hi All,

I have created a custom list. I have enter few list items in it. I have displayed the list items on a page using data view. Im getting the all the list items in the list. But when I refresh (F5) the page a duplicate list item is for the recently modified or created list item is added into the list . 

How can we stop this duplication of recently added list items.

Thanks in advance.