Open hyperlink in webbrowser visual basic vb.net

I tried to click on the hyperlink
by invokemember("click") but it
does not work maybe because the
hyperlink does not have an ID.
so is there another way to open a
hyperlink if the hyperlink contains
a certain word like "hello" using
webbrser.documenttext.contains and
then if found to open that hyperlink.

thanks in advance.