System.ServiceModel.MustUnderstandSoapException class MustUnderstandSoapException : CommunicationException Documentation Code public EnvelopeVersion EnvelopeVersion { get; } public Collection<MessageHeaderInfo> NotUnderstoodHeaders { get; } public MustUnderstandSoapException() protected MustUnderstandSoapException(SerializationInfo info, StreamingContext context) public MustUnderstandSoapException(Collection<MessageHeaderInfo> notUnderstoodHeaders, EnvelopeVersion envelopeVersion)