nats_1.cs

// create connection(default, connect to nats://localhost:4222)
await using var conn = new NatsConnection();

// for subscriber. await register to NATS server(not means await complete)
var subscription = await conn.SubscribeAsync<Person>("foo", x =>
{
    Console.WriteLine($"Received {x}");
});

// for publisher.
await conn.PublishAsync("foo", new Person(30, "bar"));

// unsubscribe
subscription.Dipose();

// ---

public record Person(int Age, string Name);