HeapProfiler.DeltaList.OnPreviewKeyDown C# (CSharp) Method

        protected override void OnPreviewKeyDown(PreviewKeyDownEventArgs e)
        {
            switch (e.KeyCode) {
                case Keys.Down:
                    SelectedIndex += 1;
                break;
                case Keys.End:
                    SelectedIndex = Items.Count - 1;
                break;
                case Keys.Home:
                    SelectedIndex = 0;
                break;
                case Keys.PageDown:
                    SelectedIndex += ScrollBar.LargeChange;
                break;
                case Keys.PageUp:
                    SelectedIndex -= ScrollBar.LargeChange;
                break;
                case Keys.Space:
                    ToggleExpandedState(SelectedIndex);
                break;
                case Keys.Up:
                    SelectedIndex -= 1;
                break;

                default:
                    base.OnPreviewKeyDown(e);
                break;
            }
        }