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