Update, here's the code

#!/usr/bin/perl
use strict;
use warnings;
use HTML::TreeBuilder;
use WWW::Mechanize;
use URI::Escape;
my $agent = WWW::Mechanize->new();

$agent->get('http://www.usgbc.org/myUSGBC/Members/MembersDirectory.asp
+x?PageID=2011&CMSPageID=140');
$agent->form_name('frmMemberDirectory');
$agent->field('ddlCategory', '');
$agent->field('ddlState', '');
$agent->field('ddlCountry', 'US');
$agent->field('txtCompanyName', '');
$agent->click('btnSearch');

my $node = HTML::TreeBuilder->new();
$node->parse( $agent->content );

my $val_id = $node->find_by_attribute( id => '__VIEWSTATE');
my $validation = $val_id->attr('value'); 
my $state_id = $node->find_by_attribute( id => '__EVENTVALIDATION');
my $view_state = $state_id->attr('value');

$validation = uri_escape( $validation );
$view_state = uri_escape( $view_state );

my $id = '__EVENTTARGET=dgMembers%24ctl01%24ctl11&__EVENTARGUMENT=&__V
+IEWSTATE='.
         $view_state .
        '&txtCompanyName=&ddlCategory=&ddlState=&ddlCountry=US&__EVENT
+VALIDATION='. 
        $validation;

$agent->post('http://www.usgbc.org/myUSGBC/Members/MembersDirectory.as
+px?PageID=2011&CMSPageID=140',
            Content => $id);
print $agent->content();

[download]

In reply to Re: scraping ASP page, __VIEWSTATE problem by Anonymous Monk
in thread scraping ASP page, __VIEWSTATE problem by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.