BEGIN TRY
BEGIN TRANSACTION

TSQL Logic here

COMMIT
END TRY
--Catch any errors above 
BEGIN CATCH
		IF @@TRANCOUNT > 0 
			ROLLBACK
					DECLARE @ErrMsg nvarchar(4000), @ErrSeverity int
					SELECT @ErrMsg = ERROR_MESSAGE(), @ErrSeverity = ERROR_SEVERITY()
			RAISERROR(@ErrMsg, @ErrSeverity, 1)
END CATCH	

We walk in the dark places no others will enter
We stand on the bridge and no one may pass

DECLARE @Err INT
SET @Err = 0
BEGIN TRANSACTION

/***Some logic here***/

--Check for any errors
SET @Err = @Err + @@ERROR

/***More logic***/

--Check for any errors
SET @Err = @Err + @@ERROR

IF @Err > 0 
	ROLLBACK
ELSE 
    COMMIT