When overridden in a derived class, gets the SOAP and WS-Addressing versions of the message.
Assembly: System.ServiceModel (in System.ServiceModel.dll)
Knowing the underlying SOAP version is important because the structure of Message is firmly correlated with that of a SOAP message.
Inheritors must note that when overridden in a derived class, this method returns a MessageVersion object for the SOAP version of the message.
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