title: Determine if a resource exists in ResourceManager
body: <p>Is there anyway to determine if a ResourceManager contains a named resource?  Currently I am catching the MissingManifestResourceException but I hate having to use Exceptions for non-exceptional situations. There must be some way to enumerate the name value pairs of a ResourceManager through reflection, or something?</p>
  
  <p><strong>EDIT</strong>:  A little more detail.  The resources are not in executing assembly, however the ResourceManager is working just fine.  If I try <code>_resourceMan.GetResourceSet(_defaultCuture, false, true)</code> I get null, whereas if I try <code>_resourceMan.GetString("StringExists")</code> I get a string back.</p>