Scraping of asp .Net Page Having Pagination Using Curl

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.NET

PHP

Hi,

Thanks for help.

I am new to screen scraping and working on an asp .Net page. On the page, there is pagination. I can scrap first page but can't next ones. Pagination is based on __doPostBack function. I get the value for for __VIEWSTATE using this code:

$file =file_get_contents($url);
preg_match("#<input.*?name=\"__viewstate\".*?value=\"(.*?)\".*?>.*?"
  ."<input.*?name=\"__eventvalidation\".*?value=\"(.*?)\".*?>#mis",
  $file,
  $arr_viewstate);
$viewstate = urlencode($arr_viewstate[1]);
$eventvalidation = urlencode($arr_viewstate[2]);

and Sending post request in curl using

CURLOPT_POSTFIELDS =>
'__EVENTTARGET='
.urlencode('ctl00$ContentPlaceHolderBody$SearchPageNavigationTop$rptPager$ctl01')
.'&__EVENTARGUMENT='
.urlencode('')
.'&__VIEWSTATE='
.$viewstate
.'&__EVENTVALIDATION='
.$eventvalidation
.'&__LASTFOCUS='
.urlencode(''));

because

ctl00$ContentPlaceHolderBody$SearchPageNavigationTop$rptPager$ctl01

value is passed to __doPostBack function when we click on page 2.
But its not working and giving content of 1st page even i pass value for 2nd or other pages.

So please guide me.

Thanks again.