BitMapImage into a byte array - XAML manipulation

I was messing with a listbox control for my windows phone app and needed to convert a series
of bitmap images.  Found this piece of code to convert the object.  Now I should be able to
use my httppost class to pass the image as a parameter.


public static byte[] ConvertToBytes(this BitmapImage bitmapImage) {    
          byte[] data = null;    
          using (MemoryStream stream = new MemoryStream()) {        
                      WriteableBitmap wBitmap = new WriteableBitmap(bitmapImage);        
                      wBitmap.SaveJpeg(stream, wBitmap.PixelWidth, wBitmap.PixelHeight, 0, 100);        
                      stream.Seek(0, SeekOrigin.Begin); data = stream.GetBuffer();    
           }    
return data;
}


Source:
http://stackoverflow.com/questions/4732807/conversion-of-bitmapimage-to-byte-array