Highlight/format the HTML content in WebBrowser Control

Question

Hai,
   To show the office word document i have used the WebBrowser Control and displaying the all the text well.
   Now i want to implement the search functionality in webbrowser Control when i type the text in textbox , all the matched string should be highlight or format of the matched string should be changed to identify them.
 i have seen the link below http://www.c-sharpcorner.com/Forums/Thread/135347/
which is closer to my need but,
how can i use that link to hightlight the matched searched string?



Thank you