public TopicConnectionHandler(TopicData data)
{
MessageReceived += DoNothing;
// set topic data
TopicData = data;
// make sure handler is clear before setting a new one
_TopicHandler = null;
// convert subscription emum to string
string subscriptionName = Enum.GetName(typeof(Subscriptions), TopicData.subscription);
// assign handler
_TopicHandler = new ServiceBusTopicHandler(TopicData.TopicConnectionString, TopicData.topic, subscriptionName, ProcessTopicMessagesAsync);
}