void OnMessage(
	long threadId,
	TraceLevel level,
	Datetime dateTime,
	string loggerName,
	string message
)

Sub OnMessage ( 
	threadId As Long,
	level As TraceLevel,
	dateTime As Datetime,
	loggerName As String,
	message As String
)

void OnMessage(
	long long threadId, 
	TraceLevel level, 
	Datetime^ dateTime, 
	String^ loggerName, 
	String^ message
)