Change view of the same RSS Feed on click of a button in asp.net with c#

I am totally new to asp.net. I have a treeview and when I select a node, the corresponding rss feed needs to be loaded on the right  side of the tree vew. If I click on button to change the view the style of rss feed displa has to change on the same page. I am not really getting any idea to start off with. How do I really create two different datalists to displya different rss styles and display on the same page?
 
 
Any help in this is really appreciated.
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