Dataview Rowfilter not working

[sebastian3]

Hi everyone, hope ur all.
After a long time i m posting here.
M in a problem abt. dataview.rowfilter. Matter is i have to create datareader from dataset, thats ok. The dataset is being filled up,no probs. After that i m applying rowfilter which is not working :

da.Fill(s);
            s.Tables[0].DefaultView.RowFilter = " user_id=1 ";
                        
            dr = s.Tables[0].CreateDataReader();

No error is thrown, but its not working. I feel thrs sum logical error.Can anyone make it out.

Thanks all.