Unhandled Exception: System.Runtime.Serialization.SerializationException: Type 'System.EnterpriseSer
vices.TransactionProxyException' in Assembly 'System.EnterpriseServices, Version=2.0.0.0, Culture=ne
utral, PublicKeyToken=b03f5f7f11d50a3a' is not marked as serializable.

User's solution

This works!

Microsoft KB article
FIX: The System.EnterpriseServices.TransactionProxyException exception cannot be caught from other application domains when it is triggered during a transaction completion:
http://support.microsoft....;spid=8291

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