TSQL - Error catching basic structure (try/catch/rollback)

begin try

begin tran

       -- YOUR STATEMENTS HERE

       commit tran

end try

begin catch

       -- Display error

       /*

       SELECT

              ERROR_NUMBER() AS ErrorNumber,

        ERROR_MESSAGE() AS ErrorMessage

       ;

       */

       print('ERROR...');

       print( 'Number: ' +  cast(ERROR_NUMBER() as varchar(50)) );

       print( 'Message: ' + cast(ERROR_MESSAGE() as varchar(max)));

       -- Announce rollback

       print('Rolling back!');

       rollback tran

end catch