RECEIVING From QUEUE By ConversationHandle

Is it possible to receive from a queue by a conversation handle? In the documentation there is an example that show you how to do it. Yet, if you "read" the whole document it says that the conversation handle can not be an expression.

The WHERE clause of the RECEIVE statement may only contain search conditions that use conversation_handle or conversation_group_id. The search condition may not contain any of the other columns in the queue. The conversation_handle or conversation_group_id may not be an expression.

Here is what I'm trying to do:

;RECEIVE TOP(1) @MsgBody = CAST(message_body as XML)

FROM ProcessingLetters

WHERE conversation_handle = @Conversation_Handle

It doesn't seem to matter if I use RECEIVE or SELECT. It will return nothing.

I've even tried this:

where cast(Conversation_Handle as varchar(100)) = cast(@Conversation_Handle as varchar(100))

Why am I doing this? I've put something into the queue to let me know that something is processing. When it is done I want to pull it out and end the conversation.

So is the WHERE conversation_handle = @Conversation_Handle supposed to work?

Thanks.