download https

hello,
can you help me ?

how can I download on my pc this kind of file ?
<iframe src="https://www.somesite.com/sdm/ent/gen/index.jsp?org=HP7X8"
scrolling="yes" width="100%" height="590" frameborder="0"></iframe>

with a webrequest I get only the html page enclosing the frame , but no
frame , neither
file !!!!

I develop with visual studio 2005 c#

philippe