Not much familiar with the RSS feed with ASP .NET, but here's a thing you can do (Basic Idea) -
1. Get RSS Feeds from different URLs and maintain DataTable foreach feed.
2. Club all the DataTables in a new DataTable. Use
DataTable.Merge Method[
^] for that. (
Example[
^])
3. And then bind that new DataTable with the DataList.
-KR