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POUnder what circumstances do you get the `System.UnauthorizedAccessException`?
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copied!<p>I am making an app to send the battery level of my Windows 8 Phone over the network asynchronously after some specific interval of times. I am using the <code>DispatcherTimer</code> for calling sending the battery level after some specific interval.</p> <pre><code>DispatcherTimer timer = new DispatcherTimer(); //Create the timer instance timer.Interval = TimeSpan.FromSeconds(15); //Set the timer interval timer.Tick += SendAsyncRequest; //Call this procedure after the time ends timer.Start(); </code></pre> <p>I want to send my the battery level using the POST request. </p> <pre><code>void SendAsyncRequest(object sender, object e) { HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://192.168.2.17/android_connect/add_device.php"); request.Method = "POST"; request.BeginGetRequestStream(new AsyncCallback(SendBatteryLevel), request); } </code></pre> <p>Now, the heart of the code where I code for sending the actual request (<code>SendBatteryLevel</code>) is as follows:</p> <pre><code>void SendBatteryLevel(IAsyncResult asynchronousResult) { HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState; using (Stream postStream = request.EndGetRequestStream(asynchronousResult)) { string username = "CoolSops"; string deviceId = "WindowsPhone"; string batteryLevel = Windows.Phone.Devices.Power.Battery.GetDefault().RemainingChargePercent.ToString(); string post_param = "username=" + username + "&device_id=" + deviceId + "&battery_level=" + batteryLevel; try { byte[] requestBody = System.Text.Encoding.UTF8.GetBytes(post_param); postStream.Write(requestBody, 0, requestBody.Length); SendingStatus.Text = "Battery data sent"; postStream.Close(); } catch (Exception e) { Deployment.Current.Dispatcher.BeginInvoke(() => { ErrorStatus.Text = e.ToString(); }); Console.WriteLine(e.Message + "\n\n" + e.Source + "\n\n" + e.StackTrace); } } } </code></pre> <p>where <code>SendingStatus</code> and <code>ErrorStatus</code> are <code>TextBlock</code>s. When I execute this code I get a <code>System.UnauthorizedAccessException</code>. The details of the exception are as follows:</p> <pre><code>A first chance exception of type 'System.UnauthorizedAccessException' occurred in System.Windows.ni.dll An exception of type 'System.UnauthorizedAccessException' occurred in System.Windows.ni.dll and wasn't handled before a managed/native boundary </code></pre> <p>I do not understand what I am trying to access in an unauthorized way. Can anybody tell why this is happening?</p> <p>Note: I noted an interesting thing while debugging the program. When the method <code>SendBatteryLevel</code> is called from the method <code>SendAsyncRequest</code>, after executing a few lines from the <code>SendBatteryLevel</code> the control goes back to <code>SendAsyncRequest</code>. I tried to figure out the exact number of lines after which the control goes back to <code>SendAsyncRequest</code> but it varies every time. So, the method <code>SendBatteryLevel</code> is called twice or sometimes thrice in this manner before the method is completely executed. May be this is what is causing the exception to occur.</p>

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