private void countdescendingToolStripMenuItem_Click(object sender, EventArgs e)
{
CategorySort sort = new CategorySort { Column = 1, Order = SortOrder.Descending };
SortCategories(sort);
}
private void SortCategories(CategorySort sort)
{
// save new sort as current sort
currentSort = sort;
// save currently selected games
SortedSet<int> selectedIds = GetSelectedGameIds();
lstCategories.BeginUpdate();
// save and remove Specials from list.
List<ListViewItem> specials = RemoveSpecials();
// Create a comparer.
lstCategories.ListViewItemSorter =
new ListViewComparer(sort.Column, sort.Order);
// Sort.
lstCategories.Sort();
// remove sort so that Specials will not get sorted as they are added.
lstCategories.ListViewItemSorter = null;
// add Specials.
InsertSpecials(specials);
// restore games selection
SelectGameSet(selectedIds);
lstCategories.EndUpdate();
}