int handID = -1;

        float TIMER = 1;

        float comparisonValue = 0.7f;

        enum CustomGestures { None, Closing, Opening } ;

        float storedSphereRadius = -1;

        DateTime afterGesture = DateTime.MaxValue;

        CustomGestures detectedGesture = CustomGestures.None;

        void FirstAttempt(Frame frame)
        {
            Hand hand;
            bool knownHand = false;
            detectedGesture = CustomGestures.None;

            double seconds = ((TimeSpan)(DateTime.Now - then)).TotalSeconds;

            //if timer expired
            if (seconds >= TIMER)
            {
                //Reset Timer and stored values in order to retrieve new ones
                resetValues();
            }

            // get hand
            if (handID == -1)
                hand = frame.Hands[0];
            else
            {
                knownHand = true;
                hand = frame.Hand(handID);
            }

            // is hand invalid?
            if (!hand.IsValid)
            {
                resetValues();
                return;
            }
            else
            {
                handID = hand.Id;
            }

            // if it's the same hand, then we have a sphereRadius value
            // from which we can do a comparison
            if (knownHand && seconds < TIMER)
            {
                //Console.WriteLine(storedSphereRadius.ToString() + "::::" + hand.SphereRadius.ToString());

                // if actual hand's sphere radius is around 65% from stored one, 
                // then we can assume the that the hand is closed
                if (hand.SphereRadius < storedSphereRadius * comparisonValue)
                {
                    detectedGesture = CustomGestures.Closing;
                    SafeWriteLine("Closing");
                    //Console.WriteLine(storedSphereRadius.ToString() + "::::" + hand.SphereRadius.ToString());

                }
                else if (hand.SphereRadius * comparisonValue > storedSphereRadius)
                {
                    detectedGesture = CustomGestures.Opening;
                    SafeWriteLine("Opening");
                    //Console.WriteLine(storedSphereRadius.ToString() + "::::" + hand.SphereRadius.ToString());
                }
            }
            // in this case, it means we have a new Hand object, 
            // hence the need to restore sphereRadius value
            else if (!knownHand)
            {
                storedSphereRadius = hand.SphereRadius;
            }

            // reset since we detected either a closing or an opening gesture
            if (detectedGesture != CustomGestures.None)
            {
                resetValues();
            }
        }

        void resetValues()
        {
            then = DateTime.Now;
            handID = -1;
            storedSphereRadius = -1;
        }

        #endregion