How do i send a Twitter direct message with a media file?

I'am using tweetsharp Library to Send a twitter direct message but not found a parameter for media although we Can upload media when we send message form twitter to any one of our followers.
So Could any one Help?

//Using tweetSharp library 
  var result = service.SendDirectMessage(new SendDirectMessageOptions
                    {
                        ScreenName = "twitterName",
                        Text = Message //No parameter for media          
     
                    });