while editing the columns in ADo net source not refresh the columns

Hi,

When i am editing the columns in the adonetsource can't able to edit it.

EG:

id       name     sal are the available columns

select id, 'name' as ename,sal from emp.

I Edited this query as :

select  id, 'empname' as ename,sal from emp

It won't affect in the source. & how to change the query using expression. in adonetsource there is no data access mode as from varible.   pls help on it.

Thanks