Add Spell check to our html editor project in windows form

Question

 

 

1.       How to prefix the selected text  with <R> and suffix with </R>.

Eg.- If My selected text in webbrowser  is "Hi Aisha " then On a click of a button in my tool strip  that Text Replaced as <R>Hi Aisha</R>and rest of the text wich were not selected remain same .no Change only Insertion of the tag happen...

2.  Add Spell Check to my Project In Windows Form