Message in Danish (Dansk)
        Hvis kontrakten <var>Contract Name</var> med DuplexChannelFactory skal bruges, skal kontrakten angive en gyldig tilbagekaldskontrakt. Hvis kontrakten ikke angiver en tilbagekaldskontrakt, skal du overveje at bruge ChannelFactory i stedet for DuplexChannelFactory.
Unlocalized message
        In order to use the contract '<var>Contract Name</var>' with DuplexChannelFactory, the contract must specify a valid callback contract. If your contract does not have a callback contract, consider using ChannelFactory instead of DuplexChannelFactory.
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