Finding RSS Feeds and displaying RSS Feeds on website using asp.net, c#

I have seen many of website are displaying RSS Feeds on their website.

Example:

1) compgroups.net

2) velocityreviews.com

3) bytes.com

4) eggheadcafe.com开发者_高级运维 And many other websites.

What i observe is Google is even giving them good rank despite of duplicate content.

What i want to know is...

How can I find RSS Feeds? Also where can i found RSS Feeds for Yahoogroups?

Read here: http://help.yahoo.com/l/ca/yahoo/groups/rss/rss-03.html

The source of an RSS feed is XML. You can request a feed from c# using the HttpRequest, providing the url of the feed. You read in the XML, process it and show its contents in your webpage.