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feedString.IndexOf(@"</feed>", 0, StringComparison.OrdinalIgnoreCase) returns some positive value and
feedString.LastIndexOf(@"</feed>", 0, StringComparison.OrdinalIgnoreCase) returns -1
You can try on any Atom feed e.g. http://www.theverge.com/rss/index.xml to get feedString to reproduce the problem.
This is correct behaviour.
You are looking for a text using backward search starting at index 0. There is no text before index 0 therefore you always get -1 as a result.