JSON & .NET C#

Hello,

Iam trying to consum a json web service. 

The doc api gives an exemple in php, i try to use c# and don't find the code to use for post HTTP. (with GET it works fine).

bellow php code (doc exemple)

<?php
 $universe = 'XXXX';
 $pass = 'XXXXXXXXXXXXXXXXXXXXXXX';
 $service_url = 'https://*XXXXXXXXX/XXX-5.pl';
 // Build a json array of recipient using data from DB or csv file
 $rcpts = array (
 array (
 'email' => 'test@customer.com',
 'firstname' => 'John',
 'lastname' => 'Doe',
 'c0' => '123456'
 ),
 array (
 'email' => 'test2@customer.com',
 'firstname' => 'Jane',
 'lastname' => 'Doe',
 'c0' => '123457'
 ),
 );

 // declare other sending parameters
 $params = array(
 'universe' => $universe, // your universe
 'key' => $pass, // your secret key
 'opcode' => 'XXXXX', // operation code to be used
 'message' => 'XXXXXXX', // EF4 message id
 'rcpts' => json_encode($rcpts), // recipients
 );
 // encode all parameters including JSON array
 $url = $service_url . '?'. http_build_query($params);
5

Trigger documentation
Splio development Team
 // API call using curl library
 $curl = curl_init();
 curl_setopt($curl, CURLOPT_URL, $url);
 // turn of SSL check just for the example.
 curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
 curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
 // can solve problems with curl
 curl_setopt($curl, CURLOPT_HTTPHEADER,array("Expect:"));
 // actual call
 $curl_response = curl_exec($curl);
 curl_close($curl);
 // print the server response
 var_dump($curl_response);
 // and the json received
 var_dump(json_decode($curl_response, true))
?>
any one have an idea?
ty

"Le temps c'est de la monnaie"