BetterExplorer.MainWindow.RotateImages C# (CSharp) Method

    private void RotateImages(object sender, RoutedEventArgs e) {
      RotateFlipType Rotation;
      string DefaultName_Addon = null;

      switch ((sender as Control).Name) {
        case "btnRotateLeft":
          Rotation = RotateFlipType.Rotate270FlipNone;
          DefaultName_Addon = "_Rotated270";
          break;
        case "btnRotateRight":
          Rotation = RotateFlipType.Rotate90FlipNone;
          DefaultName_Addon = "_Rotated90";
          break;
        case "btnFlipX":
          Rotation = RotateFlipType.RotateNoneFlipX;
          DefaultName_Addon = "_FlippedX";
          break;
        case "btnFlipY":
          Rotation = RotateFlipType.RotateNoneFlipY;
          DefaultName_Addon = "_FlippedY";
          break;
        default:
          throw new Exception("Invalid sender");
      }

      foreach (FileSystemListItem item in _ShellListView.SelectedItems) {
        var cvt = new Bitmap(item.ParsingName);
        cvt.RotateFlip(Rotation);
        if (OverwriteOnRotate) {
          cvt.Save(item.ParsingName);
        } else {
          string ext = item.ParsingName.Substring(item.ParsingName.LastIndexOf(".", StringComparison.Ordinal));
          string name = item.ParsingName;
          string namen = Utilities.RemoveExtensionsFromFile(name, new System.IO.FileInfo(name).Extension);
          var newFilePath = namen + DefaultName_Addon + ext;
          cvt.Save(newFilePath);
          this._ShellListView.UnvalidateDirectory();
        }
        cvt.Dispose();
        AddToLog("Rotated image " + item.ParsingName);
      }
    }