Bacterium.MainWindow.PointGrid_MouseLeftButtonUp C# (CSharp) Method

        private void PointGrid_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            if (_currentPoint == null)
                return;
            int x = (int)e.GetPosition(PointGrid).X;
            int y = (int)e.GetPosition(PointGrid).Y;
            if (x < _currentPoint.X || x > _currentPoint.X + MyPoint.WIDTH ||
                y < _currentPoint.Y || y > _currentPoint.Y + MyPoint.HEIGHT ||
                !_game.JumpToCell(x, y, _currentPoint))
            {
                Cell tmp = _currentPoint.CurrentCell;
                _currentPoint.SetNewLocation(tmp.X, tmp.Y);
            }
            ShowState();
            if (_game.FreeCellsAmount == 0)
                MessageBox.Show(String.Format("Game over! The winner is {0}", _game.DarkCount < _game.LightCount ? "Red team" : "Green team"));
            else
                if (_game.IsLocked)
                {
                    int lightCount = _game.LightCount + (_game.IsLightTurn ? 0 : _game.FreeCellsAmount);
                    int darkCount = _game.DarkCount + (_game.IsLightTurn ? _game.FreeCellsAmount : 0);
                    MessageBox.Show(String.Format("Game over! The winner is: {0}", (lightCount > darkCount) ? "Red team" : "Green team"));
                }
            _currentPoint.SetToBack();
            _currentPoint = null;
        }