RedditStoreApp.MainPage.mvm_PropertyChanged C# (CSharp) Метод

        private void mvm_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            if (e.PropertyName == "IsLeft")
            {
                MainViewModel mvm = (MainViewModel)this.DataContext;

                double to = 0;
                double from = 0;

                if (mvm.IsLeft && !_isLeft)
                {
                    to = -MainGrid.ColumnDefinitions[0].Width.Value;
                }
                else if (!mvm.IsLeft && _isLeft)
                {
                    from = -MainGrid.ColumnDefinitions[0].Width.Value;
                }

                if (_isLeft != mvm.IsLeft)
                {
                    DoubleAnimation d = new DoubleAnimation()
                    {
                        BeginTime = new TimeSpan(0),
                        Duration = new Duration(TimeSpan.FromMilliseconds(400)),
                        From = from,
                        To = to,
                        FillBehavior = FillBehavior.HoldEnd,
                        EasingFunction = new QuadraticEase()
                    };

                    Storyboard s = new Storyboard();
                    s.Children.Add(d);
                    Storyboard.SetTarget(d, MainGrid);
                    Storyboard.SetTargetProperty(d, "(UIElement.RenderTransform).(TranslateTransform.X)");
                    s.Begin();

                    _isLeft = !_isLeft;
                }
            }
        }