How to get row count from a flat file

Hi Experts

I am doing a job in BODS, in that i am using a validation query and i am using a flat file as target if the validation is failed. So now my requirement is to count the no.of rows migrated to the failed table so that i cant validate the job and i can raise an exception to stop the migration. how can i get the count of rows from a flat file.Please help me

Thanks in advance

Prasannakumar