CookieCollection cookies = new CookieCollection();
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://stresser.network/?p=login");

            request.CookieContainer = new CookieContainer();
            request.CookieContainer.Add(cookies);
            //Get the response from the server and save the cookies from the first request..
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            cookies = response.Cookies;


            string getUrl = "https://stresser.network/inc/ajax/login.php";
            string postData = String.Format("username={0}&password={1}", "username", "password");
            HttpWebRequest getRequest = (HttpWebRequest)WebRequest.Create(getUrl);
            getRequest.CookieContainer = new CookieContainer();
            getRequest.CookieContainer.Add(cookies);
            getRequest.Method = WebRequestMethods.Http.Post;
            getRequest.UserAgent = request.UserAgent;//"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2";
            getRequest.AllowWriteStreamBuffering = true;
            getRequest.ProtocolVersion = HttpVersion.Version11;
            getRequest.AllowAutoRedirect = true;
            getRequest.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";

            byte[] byteArray = Encoding.ASCII.GetBytes(postData);
            getRequest.ContentLength = byteArray.Length;
            Stream newStream = getRequest.GetRequestStream();
            newStream.Write(byteArray, 0, byteArray.Length);
            newStream.Close();

            HttpWebResponse getResponse = (HttpWebResponse)getRequest.GetResponse();
            using (StreamReader sr = new StreamReader(getResponse.GetResponseStream())) {
                string sourceCode = sr.ReadToEnd();
                Console.Write(sourceCode);