DECLARE @TranName VARCHAR(20)
SELECT @TranName = 'MyTransaction'
BEGIN TRANSACTION @TranName
GO
USE ts2_aldkt_app
GO
update tblcustomer
set sales_ytd = (sales_ytd + 10000)
set sales_lstyr = (sales_lstyr +  10000)
GO
COMMIT TRANSACTION MyTransaction
GO

I am getting the following error:
Line 1: Incorrect syntax near '='.
Any help is appreciated