将一段Java代码转换为C#···求高人指点··

如下·
Java中的一小段代码··
想转为C#··但是不知道怎么办···private static void encodeAndPost(String id,String ud)throws Exception{  String k= "__ap=";  String v="{\"videoId\":\""+id+"\",\"type\":\""+ud+"\"}";  v=URLEncoder.encode(v,"UTF8");  doPost(k+v);} private static void doPost(String pms)throws Exception{
 String url="......................";
  URL u = new URL(url);  HttpURLConnection connection=(HttpURLConnection)u.openConnection();  connection.setRequestMethod("POST");  connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");  connection.setRequestProperty("Content-Length",String.valueOf(pms.length()));  connection.setUseCaches(false);  connection.setDoOutput(true);  DataOutputStream dout=new DataOutputStream(connection.getOutputStream());  dout.write(pms.getBytes());  dout.flush();  dout.close();  connection.getInputStream().close();  connection.disconnect();