Hello friends, I am learning google API I want to retrieve google contacts using Authsub. And second thing is that i want to use secure token. I have X.509 certificate with private key. In first step I got token but in second step (To get AuthSubSessionToken) I got error : Invalid AuthSub token. Here my code. please, anybody have idea ? Help me....

$url = "https://www.google.com/accounts/AuthSubSessionToken";
$token = $token;
$param['sigalg'] = "rsa-sha1";
$nonce = "15948".time()."49418"; // any random no(20 digit)
$param['data'] = "GET https://www.google.com/accounts/AuthSubSessionToken ".time()." ".$nonce;
$private_key = "MY_PRIVATE_KEY";

$kvpairs = array();
foreach ($param as $k => $v) {
array_push($kvpairs, ($k . '=' . $v));
}
$query_string = '';
$query_string = implode('&', $kvpairs);
$base_string = 'GET'.'&'.$url .'&'.$query_string;
$param['sig'] = base64_encode(hash_hmac('sha1', $base_string, $private_key, true));
uksort($param, 'strcmp');
$header = 'Authorization: AuthSub token="'.$token.'" ';
foreach ($param as $k => $v)
{
$header .= $k . '="' .$v. '" ';
}

    $header = trim($header," ");
$headers\[\]= $header;
$ch = curl\_init();
curl\_setopt($ch, CURLOPT\_URL,$url);
curl\_setopt($ch, CURLOPT\_RETURNTRANSFER, true);
curl\_setopt($ch, CURLOPT\_SSL\_VERIFYPEER, false);
curl\_setopt($ch, CURLOPT\_HTTPHEADER, $headers);
$responce = curl\_exec($ch);
curl\_close($ch);

I am developing Google app (with oauth 1.0)that retrieve google contatcs but i got error : signature_invalid please help me Thx in advance

function GetRequestToken()
{
$consumer = 'YOUR_CONSUMER_KEY';
$secret = 'YOUR_CONSUMER_SECRETE';
$callback = 'http://localhost/Gcontacts/welcome/redirection';
$sign_method = 'HMAC-SHA1';
$version = '1.0';
$scope = 'https://www.google.com/m8/feeds/';
$path = "/accounts/OAuthGetRequestToken";
$mt = microtime();
$rand = mt_rand();
$nonce = md5($mt.$rand);
$time = time();
$url = 'https://www.google.com/accounts/OAuthGetRequestToken';
$post = array(
'oauth_callback' => $callback,
'oauth_consumer_key' => $consumer,
'oauth_nonce' => $nonce,
'oauth_signature_method' => $sign_method,
'oauth_timestamp' => $time,
'oauth_version' => $version,
'scope' => $scope
);
$post_string1 = '';
foreach($post as $key => $value)
{
$post_string1 .= $key.'='.($value).'&';
}
$post_string1 = trim($post_string1, '&');

$key\_part = $this->urlencodeRFC3986($secret);
$key = $key\_part;
$base\_string = $this->calculateBaseString($scope, "GET", $post);
echo $base\_string;
$signature = base64\_encode(hash\_hmac('sha1', $base\_string, $key,true));
$post\_string1 .= 'oauth\_signature'.'='.urlencode($signature);
		$post\['oauth\_signature'\] = $signature;

$header\[\] = 'POST'.$path.'?scope='.$scope.' HTTP/1.1';
$header\[\] = 'Content-Type: application/x-www-form-urlencoded';
$header\[\] = 'Accept: \*/\*';	
$header\[\] = $this->calculateHeader($post).', Content-Type: application/x-www-form-urlencoded ,Host: www.google.com';			
$ch = curl\_init();		
curl\_setopt($ch, CURLOPT\_POSTFIELDS, $post\_string1);
curl\_setopt($ch, CURLOPT\_HTTPHEADER, $header);
curl\_setopt($ch, CURLOPT\_URL, $url);
curl\_setopt($ch, CURLOPT\_POSTFIELDS, 'scope='.$scope);
curl\_setopt($ch, CURLOPT\_SSL\_VERIFYPEER,false);
curl\_setopt($ch, CURLOPT\_POST,1);
curl\_setopt($ch, CURLOPT\_RETURNTRANSFER, true);
curl\_setopt($ch, CURLOPT\_FOLLOWLOCATION, true);
$result = curl\_exec($ch);
curl\_close($ch);

}

private static function urlencode_rfc3986($value)
{
if(is_array($value)) return array_map(array('Welcome_model', 'urlencode_rfc3986'), $value);
else
{
$search = array('+', ' ', '%7E', '%');
$replace = array('%20', '%20', '~', '%25');

		return str\_replace($search, $replace, urlencode($value));
	}
}

function calculateBaseString($url, $method, array $parameters)
{
$url = (string) $url;

i got error : Invalid column name 'A1009'.

        chk1 = "select Sno from Student where SID = "+ @smemno.Text.ToString();
        
        SqlCommand ck1 = new SqlCommand(chk1, cn);
        
        v11 = (string)ck1.ExecuteScalar();

what should i do?