title: How to indicate a failed operation without exceptions (multiple appdomains)?
body: <p>I'm of the understanding that an unhandled exception in any appdomain will bring down that appdomain.  This is not unlike an unhandled exception in any standard forms- or console-based application.</p>
  
  <p>If that is so, how do you indicate a failed operation when you're crossing appdomain boundaries?  I'm currently logging it so that I know it happens, but the operation is one of several taking place within a method and I don't think anything short of an exception is going to interrupt that method.</p>
  
  <p>To put something more concrete to this, I'm setting a string property on an object (proxy) created in another appdomain.  This operation takes place in the other appdomain, but if it fails for some reason I don't want to continue with the other operations.  They all take place in a single method because I need it all to happen as a single atomic operation.  If any of the operations fail, the atomic operation as a whole needs to fail.</p>
  
  <p>I thought about something like a "last operation status" indicator that I could check after each one, but that seems kludge.  Is there a better way?</p>