public void Christmas_button_click(View v)
        {
            Calc.Clear_All();
            if (ChristmasClicked)
            {
                ChristmasClicked = false;

                FullEquationText.SetTextColor(Color.White);
                CurrentNumberText.SetTextColor(Color.White);

                hsvTotal.SetBackgroundColor(Color.Transparent);
                hsvBig.SetBackgroundColor(Color.Transparent);

                AllButtons.NormalButtons();
                SongPlayer.Pause();

                ThreadPool.QueueUserWorkItem(o => Reset_Text());
            }
            else
            {
                ChristmasClicked = true;

                FullEquationText.SetTextColor(Color.Red);
                CurrentNumberText.SetTextColor(Color.Red);

                hsvTotal.SetBackgroundColor(Color.Green);
                hsvBig.SetBackgroundColor(Color.Green);

                AllButtons.ChristmasButtons();
                SongPlayer.Replay(MediaPlayer.Create(this, Resource.Raw.ChristmasCalcMusic));
            }
        }
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.Main);

            FullEquationText  = FindViewById <TextView>(Resource.Id.Calculator_Full_equation);
            CurrentNumberText = FindViewById <TextView>(Resource.Id.Calculator_Current_Number_text);

            hsvTotal = FindViewById <HorizontalScrollView>(Resource.Id.Scroll1);
            hsvBig   = FindViewById <HorizontalScrollView>(Resource.Id.Scroll2);

            AllButtons.Setup(new List <Button>
            {
                FindViewById <Button>(Resource.Id.buttonCE),
                FindViewById <Button>(Resource.Id.buttonClear),
                FindViewById <Button>(Resource.Id.buttonBackArrow),
                FindViewById <Button>(Resource.Id.buttonDivide),
                FindViewById <Button>(Resource.Id.button7),
                FindViewById <Button>(Resource.Id.button8),
                FindViewById <Button>(Resource.Id.button9),
                FindViewById <Button>(Resource.Id.buttonTimes),
                FindViewById <Button>(Resource.Id.button4),
                FindViewById <Button>(Resource.Id.button5),
                FindViewById <Button>(Resource.Id.button6),
                FindViewById <Button>(Resource.Id.buttonMinus),
                FindViewById <Button>(Resource.Id.button1),
                FindViewById <Button>(Resource.Id.button2),
                FindViewById <Button>(Resource.Id.button3),
                FindViewById <Button>(Resource.Id.buttonPluse),
                FindViewById <Button>(Resource.Id.buttonPluseorMinus),
                FindViewById <Button>(Resource.Id.button0),
                FindViewById <Button>(Resource.Id.buttonDot),
                FindViewById <Button>(Resource.Id.buttonEquals),
                FindViewById <Button>(Resource.Id.buttonChristmas),
            });

            FullEquationText.SetTextColor(Color.White);
            CurrentNumberText.SetTextColor(Color.White);

            hsvTotal.SetBackgroundColor(Color.Transparent);
            hsvBig.SetBackgroundColor(Color.Transparent);

            AllButtons.NormalButtons();
            SongPlayer.SetUp(MediaPlayer.Create(this, Resource.Raw.ChristmasCalcMusic), CurrentNumberText, FullEquationText);
        }