title: How to get value from the object but its type is unreachable
body: <p>For instance, in my current class, there is a hashtable,</p>
  
  <pre><code>Hashtable t = GetHashable(); //get from somewhere.
  
  var b = t["key"];
  </code></pre>
  
  <p>the type of b is hidden from my current class, it is unreachable, not a public class type.</p>
  
  <p>but i want to get a value from b,  for example b has a field call "ID",
  i need to get the ID from b.</p>
  
  <p>is there anyway i can get it, reflection ???</p>