title: Under what conditions will `RealProxy.GetTransparentProxy()` return `null`?
body: <p>The documentation at <a href="http://msdn.microsoft.com/en-us/library/system.runtime.remoting.proxies.realproxy.gettransparentproxy%28v=VS.100%29.aspx" rel="noreferrer">http://msdn.microsoft.com/en-us/library/system.runtime.remoting.proxies.realproxy.gettransparentproxy%28v=VS.100%29.aspx</a> doesn't indicate a scenario where <code>GetTransparentProxy</code> will return <code>null</code>, but I'm getting a <code>null</code> back when I call it.</p>
  
  <p>What circumstances will cause this behavior?</p>