Post запрос и iframe - C#

for (int a = 1; a <= n;a++)
            {
                WebRequest request = WebRequest.Create("http://site.ru/addnews.html");
                request.Method = "POST";
                player = "<iframe width=\"510\" height=\"400\" src=\"http://xxx.com/xembed.php?video=" + linemov[a] + "\" frameborder=\"0\" scrolling=\"no\"></iframe>";
                string postData = "title="+linetit[a]+"&alt_name=&catlist%5B%5D="+cat+"&bbfont=0&bbsize=0&short_story=[img]"+lineima[a]+"[/img]&bbfont=0&bbsize=0&full_story="+player+"&tags="+teg+"&xfield%5Bplayer%5D=&xfield%5Btime%5D=&xfield%5Bshots%5D=&allow_comm=1&allow_main=1&approve=1&allow_rating=1&add=%C4%EE%E1%E0%E2%E8%F2%FC&mod=addnews";
                byte[] byteArray = Encoding.UTF8.GetBytes(postData);
                label2.Text = player;
                request.ContentType = "application/x-www-form-urlencoded";
                request.ContentLength = byteArray.Length;
                Stream dataStream = request.GetRequestStream();
                dataStream.Write(byteArray, 0, byteArray.Length);
                dataStream.Close();
                WebResponse response = request.GetResponse();
                Console.WriteLine(((HttpWebResponse)response).StatusDescription);
                dataStream = response.GetResponseStream();
                StreamReader reader = new StreamReader(dataStream);
                string responseFromServer = reader.ReadToEnd();
                Console.WriteLine(responseFromServer);
                reader.Close();
                dataStream.Close();
                response.Close();
            }