public EventHubSender(string namespaceName, string eventHubName, string publisherName, string authorization)
{
if (namespaceName == null) throw new ArgumentNullException(nameof(namespaceName));
if (eventHubName == null) throw new ArgumentNullException(nameof(eventHubName));
if (publisherName == null) throw new ArgumentNullException(nameof(publisherName));
if (authorization == null) throw new ArgumentNullException(nameof(authorization));
_uri = new Uri($"https://{namespaceName}.servicebus.windows.net/{eventHubName}/publishers/{publisherName}/messages");
_authorization = authorization;
}