robię to tak
var request = (HttpWebRequest)WebRequest.Create("https://xxx.xxx.x.xxx/user/login");
var postData = "identity=login";
postData += "&credential=haslo";
var data = Encoding.ASCII.GetBytes(postData);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = data.Length;
using (var stream = request.GetRequestStream())
{
stream.Write(data, 0, data.Length);
}
var response = (HttpWebResponse)request.GetResponse();
var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
ale dalej nie chce się zalogować odsyła mi stronę logowania