Curl + aspnet viewstate

<?PHP
function content($url,$refer='',$post='') {
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.60 Safari/537.17",
        "Referer: $refer"
));
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
if(!empty($post)) {
//echo 'POST YES -'.$post;
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $post); }
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 60);
curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookie2.txt');
curl_setopt($ch, CURLOPT_COOKIEFILE, 'cookie2.txt');
$data = curl_exec($ch);
if(curl_errno($ch)) echo '<h1>Curl error: ' . curl_error($ch);
curl_close($ch);
return $data;
 }
 
//грабим значения переменных
$a =  content("https://debt.wmtransfer.com/TenderMoneyList.aspx");
 
preg_match('#id=\"\_\_EVENTVALIDATION\"\svalue\=\"(.*)\"#U',$a,$p);
$eventvalidation = $p[1];
 
preg_match('#id=\"\_\_VIEWSTATE\"\svalue\=\"(.*)\"#U',$a,$p);
$viewstate = $p[1];
 
$post_data = "__KEEPERINSIDE=false".'&'.'__EVENTTARGET=ctl01$CPH_Grid$GV_Tenders'.'&'.'__EVENTARGUMENT=Page$4'.'&'."__VIEWSTATE=$viewstate".'&'."__EVENTVALIDATION2=$eventvalidation".'&'.'search=fdfd';
   
 
echo content('https://debt.wmtransfer.com/TenderMoneyList.aspx','https://debt.wmtransfer.com/TenderMoneyList.aspx',$post_data);
 
?>