Repeater Control - how to append next item instead of showing in the next line?

Hi guys,
Using ItemDataBound, so just by binding the repeater control to my dataset, it displays the records in a tabular style, right? If I want to have a comma-separated output like so:
 
row1, row2, row3, row4, etc...
instead of
row1
row2
row3
etc...
 
how do I go about it? Or can you point me to a site with examples please?
 
Thanks
...