If you're using ASP.NET, and the HTML file is relative to your website path:
string html = File.ReadAllText(Server.MapPath("~/virtualPathTo/file.html"));
int start_index = html.IndexOf("<div class="info">") + 18;
int end_index = html.IndexOf("</div>") + 6;
string[] return1 = html.Substring(start_index, end_index - start_index).Split(,);
html = html.Substring(end_index);
... (do the same for getting the others div informations)