public CommandFailedEvent(
	string commandName,
	Exception exception,
	Nullable<long> operationId,
	int requestId,
	ConnectionId connectionId,
	TimeSpan duration
)

Public Sub New ( 
	commandName As String,
	exception As Exception,
	operationId As Nullable(Of Long),
	requestId As Integer,
	connectionId As ConnectionId,
	duration As TimeSpan
)

new : 
        commandName : string * 
        exception : Exception * 
        operationId : Nullable<int64> * 
        requestId : int * 
        connectionId : ConnectionId * 
        duration : TimeSpan -> CommandFailedEvent