using (var duckDBConnection = new DuckDBConnection("Data Source=file.db"))
{
  duckDBConnection.Open();
  using var command = duckDBConnection.CreateCommand();
  command.CommandText = "CREATE TABLE integers(foo INTEGER, bar INTEGER);";
  var executeNonQuery = command.ExecuteNonQuery();
  command.CommandText = "INSERT INTO integers VALUES (3, 4), (5, 6), (7, 8);";
  executeNonQuery = command.ExecuteNonQuery();
  command.CommandText = "Select count(*) from integers";
  var executeScalar = command.ExecuteScalar();
  command.CommandText = "SELECT foo, bar FROM integers";
  var reader = command.ExecuteReader();
  PrintQueryResults(reader);
}
private static void PrintQueryResults(DbDataReader queryResult)
{
  for (var index = 0; index < queryResult.FieldCount; index++)
  {
    var column = queryResult.GetName(index);
    Console.Write($"{column} ");
  }
  Console.WriteLine();
  while (queryResult.Read())
  {
    for (int ordinal = 0; ordinal < queryResult.FieldCount; ordinal++)
    {
      var val = queryResult.GetInt32(ordinal);
      Console.Write(val);
      Console.Write(" ");
    }
    Console.WriteLine();
  }
}