title: create an empty BitmapSource in C#
body: <p>What is the fastest (few lines of code and low resource usage) way to create an empty (0x0 px or 1x1 px and fully transparent) <a href="http://msdn.microsoft.com/de-de/library/system.windows.media.imaging.bitmapsource.aspx" rel="nofollow noreferrer">BitmapSource</a> instance in c# that is used when nothing should be rendered.</p>