gistfile1.cs

        private async void OnWebcamButton(object sender, RoutedEventArgs e)
        {
            var captureUi = new CameraCaptureUI();
            var result = await captureUi.CaptureFileAsync(CameraCaptureUIMode.Photo);
            var file = await result.OpenForReadAsync();
            var reader = new DataReader(file);

            byte[] data = new byte[reader.UnconsumedBufferLength];
            await reader.LoadAsync(reader.UnconsumedBufferLength);
            reader.ReadBytes(data);

            Debug.Text = String.Format("Buffer is {0} bytes", data.Length);
        }