tente isso
OracleDataAdapter yourAdapter = new OracleDataAdapter(strSQLString, connection);
yourAdapter.SelectCommand.CommandTimeout=120;
yourAdapter.fill(yourDataSet);
verifique o link para saber mais sobre commandtimeout
OracleDataAdapter yourAdapter = new OracleDataAdapter(strSQLString, connection);
yourAdapter.SelectCommand.CommandTimeout=120;
yourAdapter.fill(yourDataSet);