Here`s my code
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// generate thumbnail image source
BitmapImage imageSource = new BitmapImage();
using(MemoryStream ms = new MemoryStream())
{
thumbnailImageItem.Source.Thumbnail.GetThumbnailImage(64, 64).Save(ms, new Vintasoft.Imaging.Codecs.Encoders.JpegEncoder());
ms.Seek(0, SeekOrigin.Begin);
imageSource.BeginInit();
imageSource.StreamSource = ms;
imageSource.EndInit();
}