In NServiceBus version 8 and earlier, the indication that a message was marked for immediate dispatch was provided by
SendOptions.. In version 9, this method has been renamed to
DataBus interface changes
Starting with NServiceBus version 8, it is mandatory to provide a serializer to the data bus configuration API. The
BinaryFormatterDataBusSerializer has been removed and
SystemJsonDataBusSerializer is the default option that's built-in.