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
)

abstract OnMessage : 
        threadId : int64 * 
        level : TraceLevel * 
        dateTime : Datetime * 
        loggerName : string * 
        message : string -> unit