var requeststring = "h**p***s.youtube*c*m/s?on3g=0&app=youtube_mobile&preq=*******************";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(requeststring);
request.KeepAlive = true;
request.Referer = "h**p***m*youtube*c*m";
request.Method = "GET";
request.UserAgent = "Mozilla/5.0 (iPhone; U; CPU like Mac OS X; en) AppleWebKit/420+ (KHTML, like Gecko) Version/3.0 Mobile/1A543a Safari/419.3";
request.Timeout = 10000;
request.ReadWriteTimeout = 10000;
request.Host = "s.youtube.com";
request.Accept = "*/*";
request.Headers.Add("Accept-Charset:ISO-8859-1,utf-8;q=0.7,*;q=0.3");
request.Headers.Add("Accept-Encoding:gzip,deflate,sdch");
request.Headers.Add("Accept-Language:it-IT,it;q=0.8,en-US;q=0.6,en;q=0.4");