How to parse reader comments in new source comment sections

I enjoy reading through the comment sections to articles in various news sources.   However, the good comments are often hidden in the over abundance of spam and mind-numbing commentary.  I would like to write an application that will selectively
extract certain comments that I feel will most likely offer informative content (i.e. to reduce the time and my effort to find comments worth reading).   For example, mind-numbing comments which I wish to ignore general consist of single sentences
and it is not unusual for a comment section to have hundreds if not thousands of them.  Conversely, many informative comments are much longer in length (e.g. two or more paragraphs). 
I am proficient in developing desk top applications in a rich client environment but have only minimal experience working with web-related applications.   As such, I am looking for suggestions on how I should approach this small project and work
through it.
1) Is anyone aware of existing projects or sample source code which parses the contents of web pages using .NET?
2) It is possible to view the source of a browser web page.  For example, in IE10 I from the main menu [View][Source].   The source includes the text of the article but none of the comments.  That is, the actual comments are not
included in the rendered HTML (e.g. view the source for
http://www.cbc.ca/news/business/target-s-launch-into-canada-a-multifaceted-failure-1.2901789).   So how can I obtain the comments so that I can then filter the ones I wish to review and ignore all the others.
If I should be posting this request in another forum then please let me know.
ThanX
Ian

See the webpage below.  The DownLoadFile method or the method I posted at the end will get entire webpage.
https://social.msdn.microsoft.com/Forums/vstudio/en-US/a75fb1e0-75a5-42eb-ad26-6d461eb94c69/why-my-calculation-using-while-and-substring-to-extract-string-from-text-is-not-extracting-the-right?forum=csharpgeneral#c743616a-ef72-4dd2-a22a-9c8c40ec784b
jdweng

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