Question

I want check that that provided Rss feed Link Is valid or not and is it working right now?

Answer 1

Just load the URL and check that it is actually an RSS feed.

try {
  var feedDoc = XDocument.Load(url);
  return ValidateRss(feedDoc); // implementation left as an exercise for the reader.
}
catch(HttpException) { // perhaps others
  return false;
}