select command doesn't execute in oracle 10g

Hi There;

In my part of the code, I connect to oracle database and execute the following code sector:

try
            {
                openConnection();

                LogReadDataTable(dataTable, sqlWord);
                using (OracleDataAdapter DataAdapter = new OracleDataAdapter(sqlWord, myOracleConnection))
                {
                    if (IsTransactional) DataAdapter.SelectCommand.Transaction = Transaction;

                    int sonuc = DataAdapter.Fill(dataTable);
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                closeConnection();
            }

Sql word works fine in toad oracle. It doesn't throw any execution. How to overcome this?