Deletes a topic and all its subscriptions.
            Deleting a topic might prevent some messages previously sent to the topic from being delivered to
            subscribers.
            
 Declaration Syntax
 Declaration Syntax| C# | 
DeleteTopicResponse DeleteTopic( DeleteTopicRequest request )
 Parameters
 Parameters- request (DeleteTopicRequest)
- Delete Topic request
 Return Value
 Return ValueDelete Topic  Response from the service
 Remarks
 Remarks
            This operation is idempotent, so deleting a topic that does not
            exist will not result in an error.