5 Unhandled Exception: System.SystemException: Async throws exception
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8 at foo.async_callback(IAsyncResult ar)
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9 at System.Runtime.Remoting.Messaging.AsyncResult.SyncProcessMessage(IMessage msg)
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10 at System.Runtime.Remoting.Messaging.StackBuilderSink.AsyncProcessMessage(IMessage msg, IMessageSink replySink)
12 Exception rethrown at [0]:
13 at System.Runtime.Remoting.Proxies.RealProxy.EndInvokeHelper(Message reqMsg, Boolean bProxyCase)
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14 at System.Runtime.Remoting.Proxies.RemotingProxy.Invoke(Object NotUsed, MessageData& msgData)
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15 at foo_delegate.EndInvoke(IAsyncResult result)
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