PublishTypedMessageToKafka.cs

// Create a producer that can be used to send messages to kafka that have no key and a value of type PageViewEvent 
using var producer = new ProducerBuilder<Null, PageViewEvent>(config)
                      .Build();
//Construct a message to send (generic type must match what was used above when creating the producer)
var message = new Message<Null, PageViewEvent>
              {
                    Value = new PageViewEvent{ pageUrl=$"http://kafkaexample/{value}"}
              };

await producer.ProduceAsync("kafka-topic-name", message) ;