private async Task <BitmapImage> getImage(Uri uri)
{
//StorageFile file = await StorageFile.GetFileFromPathAsync(uri.AbsoluteUri);
//IRandomAccessStreamReference thumbnail = RandomAccessStreamReference.CreateFromUri(uri);
//StorageFile file = await StorageFile.CreateStreamedFileFromUriAsync("duyuru.jpg", uri, thumbnail);
Stream stream = await Define.DownloadStreamAsync(new Uri("http://www.adobe.com/content/dam/Adobe/en/products/acrobat/pdfs/adobe-acrobat-xi-esign-pdf-file-tutorial-ue.pdf"));
BitmapImage bitmapImage = new BitmapImage();
MemoryStream ms = new MemoryStream();
stream.CopyTo(ms);
IRandomAccessStream a1 = await ConvertToRandomAccessStream(ms);
await bitmapImage.SetSourceAsync(a1);
return(bitmapImage);
}