Oracle.dataaccess !!exclusive!! -

using (OracleConnection conn = new OracleConnection(connStr))

.NET App → Oracle.DataAccess.dll → Oracle Client → SQL*Net → Oracle Database

DataTable dt = new DataTable(); // ... fill DataTable using (OracleConnection conn = new OracleConnection(connStr))

using (OracleConnection conn = new OracleConnection(connStr))

using (OracleDataReader reader = cmd.ExecuteReader())