textbox - select multiple ranges of text in text box silverlight -

i have text box control , want select multiple ranges of text when click on button. example: text :"i want select" , want selected words "want" , "select".

do have idea of how implement this?

thanks,pavel.

not sure if you're looking but:

var words = textbox1.trim().split(' '); 

then have array of strings of words. . trim() ensures don't have spaces in front or after 'sentence'.