Service Broker On The Same Database.

I'm trying to create a service broker on the same database...with one service and one queue. But my queue ends up with nothing in it. Here is the source...what's wrong?

Alter Database adventureworks set ENABLE_BROKER;

ALTER AUTHORIZATION ON DATABASE::[adventureworks] TO [SA];

create master key encryption by password = 'P@SSw0Rds';

CREATE MESSAGE TYPE CreateQBLetters VALIDATION = NONE

CREATE MESSAGE TYPE LetterResponse VALIDATION = NONE

CREATE CONTRACT BuildQBLetters (CreateQBLetters SENT BY INITIATOR, LetterResponse SENT BY TARGET)

CREATE QUEUE BuildLettersQueue with status=on

CREATE SERVICE CreateQBLetters ON QUEUE BuildLettersQueue

-- At this point, we can begin the conversation

DECLARE @conversationHandle UNIQUEIDENTIFIER

DECLARE @message NVARCHAR(max)

BEGIN

BEGIN TRANSACTION;

BEGIN DIALOG @conversationHandle

FROM SERVICE CreateQBLetters

TO SERVICE 'CreateQBLetters'

ON CONTRACT BuildQBLetters

-- Send a message on the conversation

SET @message = N'Hello World';

SEND ON CONVERSATION @conversationHandle MESSAGE TYPE CreateQBLetters (@message)

END CONVERSATION @conversationHandle

COMMIT TRANSACTION

END

GO

select * from sys.transmission_queue

select * from sys.conversation_endpoints

-- peek into the queue

select cast(message_body as nvarchar(max)) from BuildLettersQueue

GO

-- Receive a message from the queue

--RECEIVE CONVERT(nvarchar(max), message_body) AS message FROM BuildLettersQueue



-- Cleanup

DROP SERVICE CreateQBLetters

DROP QUEUE BuildLettersQueue

DROP CONTRACT BuildQBLetters

DROP MESSAGE TYPE CreateQBLetters

DROP MESSAGE TYPE LetterResponse

GO

-- you have to clean out the service broker first -- a conversation could be hanging around

alter database adventureworks set NEW_BROKER;

GO

DROP master key

go