Catrobat.IDE.WindowsPhone.Controls.ListsViewControls.CatrobatListView.CatrobatListView.SmartSelectedItems_CollectionChanged C# (CSharp) Method

        void SmartSelectedItems_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
        {
            SelectedItems.CollectionChanged -= SelectedItems_CollectionChanged;
            for (int i = 0; i < Clvw.SmartSelectedItems.Count; i++)
            {
                if ((SelectedItems as IList).Contains(Clvw.SmartSelectedItems[i]) == false)
                {
                    (SelectedItems as IList).Add(Clvw.SmartSelectedItems[i]);
                }
            }
            for (int i = (SelectedItems as IList).Count - 1; i >= 0; i--)
            {
                if (Clvw.SmartSelectedItems.Contains((SelectedItems as IList)[i]) == false)
                {
                    (SelectedItems as IList).RemoveAt(i);
                }
            }
            SortSelectedItems();
            SelectedItems.CollectionChanged += SelectedItems_CollectionChanged;
        }