vb.net - form upload get other form variables in asp.net -

i have asp.net form upload box copied msdn. after form submitted, instead of displaying information on page, want page redirect 2 query parameters, filename , number hidden form field, in same form , upload box. how can number after form submits add redirect code. form field name 'id'

<script runat="server"> protected sub button1_click(byval sender object, _   byval e system.eventargs)      if fileupload1.hasfile         try             fileupload1.saveas("c:\inetpub\sites\rebbetzin\uploads\" & _                fileupload1.filename)             label1.text = "file name: " & _                fileupload1.postedfile.filename & "<br>" & _                "file size: " & _                fileupload1.postedfile.contentlength & " kb<br>" & _                "content type: " & _                fileupload1.postedfile.contenttype                  response.redirect("http://www.rebbetzins.org/thanks.asp?id=" &  ______ & "&f=" & fileupload1.postedfile.filename )         catch ex exception             label1.text = "error: " & ex.message.tostring()         end try     else         label1.text = "you have not specified file."     end if end sub 

the value stored in request.form collection, this:

request.form("id") 

so response.redirect code should this:

response.redirect("http://www.rebbetzins.org/thanks.aspx?id=" & request.form("id") & "&f=" & fileupload1.postedfile.filename ) 

note: thanks page .aspx , not .asp extension, right? changed .aspx in answer.

update:

since have asp.net server control holding hidden value, can instead:

me.id2.value 

so response.redirect this:

response.redirect("http://www.rebbetzins.org/thanks.aspx?id=" & me.id2.value & "&f=" & fileupload1.postedfile.filename ) 

update 2:

to populate asp.net hiddenfield control in thanks.aspx page, need read out of query string in page_load event, this:

protected sub page_load(sender object, e eventargs)     if request.querystring("id") isnot nothing         me.id2.value = request.querystring("id")     end if end sub