Dataset not taking more than 39 rows!

Question

I have a dataset that I fill using Microsoft ODP.net and Oracle9i database. The sql returns 60 rows, however the OracleHelper.ExecuteMappedDataset returns 0 rows. I found out that if the number of data rows returned is less than 40 I see the data in the dataset with count = 39 otherwise the count = 0 Any idea what could be causing it? Thanks J.