Either change the sql query
SELECT col1, CASE WHEN col3 = 'DEL' THEN 0 ELSE col2 END AS [col2], col3
FROM
Or use an expression for column 2
=IIF(Fileds!col3.Value = "DEL",0,Fileds!col2.Value)
Far away is close at hand in the images of elsewhere.
Anon.