ALTER PROC usp_AccountTransaction  

    @AccountNum INT,  

    @Amount DECIMAL  

AS  

BEGIN  

    BEGIN TRY --Start the Try Block..  

        BEGIN TRANSACTION -- Start the transaction..  

            UPDATE MyChecking SET Amount = Amount - @Amount  

                WHERE AccountNum = @AccountNum  

            UPDATE MySavings SET Amount = Amount + @Amount  

                WHERE AccountNum = @AccountNum  

        COMMIT TRAN -- Transaction Success!  

    END TRY  

    BEGIN CATCH  

        IF @@TRANCOUNT > 0  

            ROLLBACK TRAN --RollBack in case of Error  

        -- you can Raise ERROR with RAISEERROR() Statement including the details of the exception  

        RAISERROR(ERROR_MESSAGE(), ERROR_SEVERITY(), 1)  

    END CATCH  

END  

GO