Mobile

<pre lang="C#">I have problem with this visual c# uwp code when I am trying to save to text file with raspberry pi 3 with Windows 10 IoT.
 var path = @"urls.txt";
 var folder = Windows.ApplicationModel.Package.Current.InstalledLocation;
 var file = await folder.GetFileAsync(path);
 var lines = await Windows.Storage.FileIO.ReadLinesAsync(file);
 (lines[0]) = textBoxRadio.Text;
 (lines[1]) = textBoxRadio2.Text;
 await Windows.Storage.FileIO.WriteLinesAsync(file, lines);

Unhandled exception at 0x75DC0D6F (twinapi.appcore.dll) in blinky.exe: 0xC000027B: An application-internal exception has occurred 
 (parameters: 0x038CF1D0, 0x00000001). occurred
 and the application halted.

I am working in a custom camera renderer implemented a form.

> TurnTorchOnOff() - The problem is that Doesnot WORK!
Here is the code:

public void TurnTorchOnOff()
{
if (_mediaCapture.VideoDeviceController.FlashControl.Supported)
{
_mediaCapture.VideoDeviceController.FlashControl.Enabled = true;
_mediaCapture.VideoDeviceController.FlashControl.Auto = false;
if (_mediaCapture.VideoDeviceController.FlashControl.PowerSupported)
{
_mediaCapture.VideoDeviceController.FlashControl.PowerPercent = 100;
}
if (_mediaCapture.VideoDeviceController.FlashControl.AssistantLightSupported)
_mediaCapture.VideoDeviceController.FlashControl.AssistantLightEnabled = false;
}
else
{
UserDialogs.Instance.Alert("No Flash Control supported on this device", Strings.Atte