Appends a (empty) message of the specified 'messageType' that will be published under the specified 'topic' with the specified 'sequenceNumber' to the event referenced by this EventFormatter. After a message has been appended its elements can be set using the various 'SetElement' methods. The behavior is undefined unless the 'sequenceNumber' is greater (unless the value wrapped) than the last value used in any previous message on this 'topic'.

public void AppendMessage(
	string messageType,
	Topic topic,
	Nullable<int> sequenceNumber
)

Public Sub AppendMessage ( 
	messageType As String,
	topic As Topic,
	sequenceNumber As Nullable(Of Integer)
)

public:
void AppendMessage(
	String^ messageType, 
	Topic^ topic, 
	Nullable<int> sequenceNumber
)