public Client Add(string sessionId, IFlexServiceCallback callback)
 {
     lock (this._ClientBlock)
     {
         Client client = new Client(sessionId, callback);
         this._ClientDict[sessionId] = client;
         return client;
     }
 }
 public Client(string sessionId, IFlexServiceCallback callback)
 {
     this.SessionID = sessionId;
     this.CallbackChannel = callback;
 }