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copied!<p>The issue is with how you're dealing with the accessing the original requests in the callback from <code>BeginGetResponse</code>.</p> <p>Rather than holding a reference ot the state, get a reference back to the original request with:</p> <pre><code>var request = (HttpWebRequest)asynchronousResult.AsyncState; </code></pre> <p>Have a look at this very basic (but working) example of implementing logging in by posting email and password credentials to a website.</p> <pre><code>public static string Email; public static string Password; private void LoginClick(object sender, RoutedEventArgs e) { Email = enteredEmailAddress.Text.Trim().ToLower(); Password = enteredPassword.Password; var request = (HttpWebRequest)WebRequest.Create(App.Config.ServerUris.Login); request.ContentType = "application/x-www-form-urlencoded"; request.Method = "POST"; request.BeginGetRequestStream(ReadCallback, request); } private void ReadCallback(IAsyncResult asynchronousResult) { var request = (HttpWebRequest)asynchronousResult.AsyncState; using (var postStream = request.EndGetRequestStream(asynchronousResult)) { using (var memStream = new MemoryStream()) { var content = string.Format("Password={0}&Email={1}", HttpUtility.UrlEncode(Password), HttpUtility.UrlEncode(Email)); var bytes = System.Text.Encoding.UTF8.GetBytes(content); memStream.Write(bytes, 0, bytes.Length); memStream.Position = 0; var tempBuffer = new byte[memStream.Length]; memStream.Read(tempBuffer, 0, tempBuffer.Length); postStream.Write(tempBuffer, 0, tempBuffer.Length); } } request.BeginGetResponse(ResponseCallback, request); } private void ResponseCallback(IAsyncResult asynchronousResult) { var request = (HttpWebRequest)asynchronousResult.AsyncState; using (var resp = (HttpWebResponse)request.EndGetResponse(asynchronousResult)) { using (var streamResponse = resp.GetResponseStream()) { using (var streamRead = new StreamReader(streamResponse)) { string responseString = streamRead.ReadToEnd(); // do something with responseString to check if login was successful } } } } </code></pre>

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