public class Rabbit
{
    public IConnection GetConnection(string hostName, string userName, string password)
    {
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.HostName = "localhost";
        connectionFactory.UserName = "guest";
        connectionFactory.Password = "guest";
        connectionFactory.Port = 5672; // 5672 for regular connections, 5671 for connections that use TLS
        return connectionFactory.CreateConnection();
    }

    public  void Send(string queue, string data)
    {
        using (IConnection connection = new ConnectionFactory().CreateConnection())
        {
            using (IModel channel = connection.CreateModel())
            {
                channel.QueueDeclare(queue, false, false, false, null);
                channel.BasicPublish(string.Empty, queue, null, Encoding.UTF8.GetBytes(data));
            }
        }
    }

    public  void Receive(string queue)
    {
        using (IConnection connection = new ConnectionFactory().CreateConnection())
        {
            using (IModel channelconsumer = connection.CreateModel())
            {
                channelconsumer.QueueDeclare(queue, false, false, false, null);
                BasicGetResult result = channelconsumer.BasicGet(queue, true);
                if (result != null)
                {
                    string data =
                    Encoding.UTF8.GetString(result.Body);
                    Console.WriteLine(data);
                }
            }
        }
    }
}

public ListOfCalculationTasks GetCalculationWorkList()
{
    using (var webClient = new WebClient() { Encoding = Encoding.UTF8 })
    {
        ....
        var str = webClient.DownloadString(Settings.CalculationWorkerGetUrl);
        var rabbit = new Rabbit();

        rabbit.Send("key", str);
    }
}