var request = (HttpWebRequest)WebRequest.Create("https://www.herofire.org/api/userlogin");

            var postData = "username=" + textBox1.Text;
            postData += "&password=" + textBox2.Text;
            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 json = new StreamReader(response.GetResponseStream()).ReadToEnd();