Conversion failed when converting from a character string to uniqueidentifier

I have a stored procedure that I am trying to show the UserName that created the entry.  I store the CreatedUser as a VarChar in the Comment table but the information input there comes from the aspnet_Users tables and is a Uniqueidentifier.  Any suggestions?  Thank you.
ALTER PROCEDURE dbo.GetComments_VendorByOPK
				(
				@OrdersProductKey Int
				)
	
	AS


	SELECT        op.OrdersProductKey, u.UserName, oc.Created, oc.OrdersComment
	FROM            OrdersProduct AS op INNER JOIN
	                         OrdersComments AS oc ON op.OrdersProductKey = oc.OrdersProductKey INNER JOIN
	                         aspnet_Users AS u ON CAST(oc.CreatedUser AS UNIQUEIDENTIFIER) = u.UserId
	WHERE        (op.OrdersProductKey = @OrdersProductKey) AND (oc.VendorView = '1')
	 
	RETURN

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rcowen00Asked:
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dqmqCommented:
>I store the CreatedUser as a VarChar in the Comment table but the information input there comes from the aspnet_Users tables and is a Uniqueidentifier.

Then you already have a mechanism for convering UniqueIdentifier to varchar.  Use it here:

  aspnet_Users AS u ON oc.CreatedUser = cast(u.userid as varchar(36)) <--or however you did it

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rcowen00Author Commented:
Thanks, that did it.  Sometimes I can't see the forest for the trees:)
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Microsoft SQL Server 2005

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