filter,该怎么解决

filter
我想让我的filter（）过滤时不区分大小写，改怎么做
string DWfilter
string ss
ss=trim(sle_1.text)
DWfilter = "productname like'%" + ss + "%'"
dw_1.setfilter( dwfilter)
dw_1.filter( )

[解决办法]
DWfilter = "upper(productname) like'%" + upper(ss) + "%'"

[解决办法]
頂一個
[解决办法]