title: Image.FromStream - Parameter is not valid
body: <p>I have list with objects. 
  Object has a stream (image i'm loading from website). </p>
  
  <p>When i write: </p>
  
  <pre><code>var image1= Image.FromStream(((dane_aukcji)(engine.items[1])).stream);
  var image2 = Image.FromStream(((dane_aukcji)(engine.items[1])).stream);
  </code></pre>
  
  <p>first line is working good, and i'm getting correct picture; 
  but on second line i get error -   Parameter is not valid</p>
  
  <p>i don't understand - is first line changing a stream ?</p>