Amoeba.Windows.UploadControl._listView_GridViewColumnHeader_Click C# (CSharp) Method

        private void _listView_GridViewColumnHeader_Click(object sender, RoutedEventArgs e)
        {
            var item = e.OriginalSource as GridViewColumnHeader;
            if (item == null || item.Role == GridViewColumnHeaderRole.Padding) return;

            var headerClicked = item.Column.Header as string;
            if (headerClicked == null) return;

            ListSortDirection direction;

            if (headerClicked != Settings.Instance.UploadControl_LastHeaderClicked)
            {
                direction = ListSortDirection.Ascending;
            }
            else
            {
                if (Settings.Instance.UploadControl_ListSortDirection == ListSortDirection.Ascending)
                {
                    direction = ListSortDirection.Descending;
                }
                else
                {
                    direction = ListSortDirection.Ascending;
                }
            }

            this.Sort(headerClicked, direction);

            Settings.Instance.UploadControl_LastHeaderClicked = headerClicked;
            Settings.Instance.UploadControl_ListSortDirection = direction;
        }