Scrping content from HTMLwhich executes code/text using javascript

i use httpwebrequest to obtain HTML source from a website.

Now when the HTML source is downloaded and obtained using streamreader. instead of the details I need I get
some messages saying "your browser need javascript enabled"

I know I can use a web browser control but is there a way to "execute" the javascript using httpwebrequest and get the data/text it should show?

Well, no. Javascript only runs in a javascript environment. All you're doing in essence is downloading a text file.