Modify HTML file in a c sharp class

Question

First of all my application is not a web application. My aim is reading html files and modify them.

So that I write this code:

    string fileName =         


        

Answer 1

Get position of start and end index of section_1

stringIndex =StringNthOccFinder.IndexOfNth(HtmlSting, "", 0, 14);

get HTML section which you want to remove

  HtmlSection= result.Substring(stringIndex , endIdex - stringIndex );

Replace html section to ""

   result = result.Replace(HtmlSection, "");