Description

It is a message broker with message queues and publish-subscribe topics.

Configure the service bus on Azure

Azure portal → Service Bus → Add
Create namespace: the namespace will be the url use by the service bus
Once deployed, go to the newly create service bus namespace → add queue

Code

Add Nuget package Azure.Messaging.ServiceBus

Sender/program.cs

private const string ConnectionString = "get it from Azure Portal → Service Bus Namespace → Shared access policy → Primary Connection String";
private const string QueueName = "myqueue";

static async Task Main(string[] args)
{
    var client = new ServiceBusClient(ConnectionString);
    var sender = client.CreateSender(QueueName);

    var message = new ServiceBusMessage("Hello!");
    await sender.SendMessageAsync(message);
}