ProgressMessageHandler
The  ProgressMessageHandler provides a mechanism for getting progress event notifications
            when sending and receiving data in connection with exchanging HTTP requests and responses.
            Register event handlers for the events  HttpSendProgress and  HttpReceiveProgress
            to see events for data being sent and received.
            
                
Occurs every time the client receiving data is making progress.
            
Occurs every time the client sending data is making progress.
            
public ProgressMessageHandler()
Initializes a new instance of the  ProgressMessageHandler class.
            
Initializes a new instance of the  ProgressMessageHandler class.