Web serivce wsse security

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C#

webservice

WSE

hey guys, does any one has an idea about, how to generate Nonce with wsse in C#

$timestamp     = gmdate('Y-m-d\TH:i:s\Z');
$password = 'XXXXXXX';
        $nonce  = mt_rand();
        
        $passdigest = base64_encode(
                        pack('H*',
                                sha1(
                                        pack('H*', $nonce) . pack('a*',$timestamp).
                                        pack('a*',$password)
                                     )
                             )
                        );

echo $timestamp;
echo '/////////';
echo $passdigest;
echo '/////////';
echo base64_encode(pack('H*', $nonce));;

Above is the php code which i have to do it in C#