c# ado .net dataset

DataSet dataSet = new DataSet();

using (SqlConnection sqlConnection
    = new SqlConnection(connectionString.ConnectionString)) {
    SqlDataAdapter sqlDataAdapter = new SqlDataAdapter();
    sqlDataAdapter.SelectCommand = new SqlCommand(sql, sqlConnection);

    sqlDataAdapter.Fill(dataSet);
}

foreach (DataTable table in dataSet.Tables) {
    foreach (DataRow row in table.Rows) {
        Console.WriteLine($"{row[0]} {row["PersonName"]}");
    }
}