Авторизация в Instagram с RestSharp

public class Instagram
    {
        private const string USER_AGENT =
            "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_3) " +
            "AppleWebKit/537.36 (KHTML, like Gecko) " +
            "Chrome/45.0.2414.0 Safari/537.36";
 
        public static string GetAnware()
        {
 
var client = new RestClient("https://www.instagram.com/");
 
client.CookieContainer = new CookieContainer();
client.UserAgent = USER_AGENT;
var firstRequest = new RestRequest("/", Method.GET);
var firstResponse = client.Execute(firstRequest);
 
var csrftoken = firstResponse.Cookies.First(x => x.Name == "csrftoken").Value;
 
var loginRequest = new RestRequest("/accounts/login/ajax/", Method.POST);
loginRequest.AddHeader("X-CSRFToken", csrftoken);
loginRequest.AddHeader("X-Requested-With", "XMLHttpRequest");
loginRequest.AddHeader("X-Instagram-AJAX", "1");
loginRequest.AddHeader("Referer", client.BaseUrl.ToString());
loginRequest.AddParameter("username", username);
loginRequest.AddParameter("password", password);
 
var loginResponse = client.Execute<LoginResponse>(loginRequest).Data;
}
 
public class LoginResponse
{
    public string status { get; set; }
    public bool authenticated { get; set; }
}