I’m going to publish some messages to rabbitmq exchanges.

According to rabbitmq documentation:
https://www.rabbitmq.com/tutorials/tutorial-three-dotnet

using System.Text;
using RabbitMQ.Client;

var factory = new ConnectionFactory { HostName = "localhost" };
using var connection = factory.CreateConnection();
using var channel = connection.CreateModel();

channel.ExchangeDeclare(exchange: "logs", type: ExchangeType.Fanout);

var message = GetMessage(args);
var body = Encoding.UTF8.GetBytes(message);
channel.BasicPublish(exchange: "logs",
                     routingKey: string.Empty,
                     basicProperties: null,
                     body: body);
Console.WriteLine($" [x] Sent {message}");

Console.WriteLine(" Press [enter] to exit.");
Console.ReadLine();

Which works but may concern is about managing open connection.
Whenever I hit method with publish it has to open connection before.
Shouldn’t I open rabbitmq connection once (during app launch for exmaple) a inject it into my class?

Then using only channel in my class?

using var channel = connection.CreateModel();