private async void OnTakePhotoClick(object sender, RoutedEventArgs e)
{
    //Take photo or video
    CameraCaptureUI cameraCapture = new CameraCaptureUI();          
    StorageFile media = await cameraCapture.CaptureFileAsync(CameraCaptureUIMode.PhotoOrVideo);


    //add todo item
    var todoItem = new TodoItem() { Text = "test image", ImageName = media.Name };
    await todoTable.InsertAsync(todoItem);
    items.Add(todoItem);
  
    //Upload image with HttpClient to the blob service using the generated item.SAS
    using (var client = new HttpClient())
    {
        //Get a stream of the media just captured
        using (var fileStream = await media.OpenStreamForReadAsync())
        {
            var content = new StreamContent(fileStream);
            content.Headers.Add("Content-Type", media.ContentType);
            content.Headers.Add("x-ms-blob-type", "BlockBlob");


            using (var uploadResponse = await client.PutAsync(new Uri(todoItem.SAS), content))
            {
                //TODO: any post processing
            }
        }
    }           
}