Once users are subscribed to the topic, the publisher can publish messages to the topic which are automatically distributed to all the subscribers of that topic.

A message can be published by invoking the Publish() function of the SNS client class. The function accepts the message string, message subject, and the ARN of the topic:

sns_object.Publish(new PublishRequest
{
    Subject = "Test",
    Message = "Testing testing 1 2 3",
    TopicArn = Topic_Arn_id
});