string url = "https://www.instagram.com/";
        private void Login()
        {
            string user = label1.Text;
            string pass = label2.Text;
            http.Cookies = new CookieDictionary();
            string html = http.Get(url).ToString();
            string token = Regex.Match(html, "{\"csrf_token\":\"(.*?)\"").Groups[1].Value;
           // MessageBox.Show(token);
            http.AddHeader("X-CSRFToken", token);
            http.AddHeader("X-Requested-With", "XMLHttpequest");
            http.AddHeader("Referer", url);
            html = http.Post("https://www.instagram.com/accounts/login/ajax/", "username=" + user + "&password=" + pass, "application/x-www-form-urlencoded").ToString();