protected override void MovePrevius() { // Create OpenFileDialog OpenFileDialog dlg = new OpenFileDialog(); // Set filter for file extension and default file extension dlg.DefaultExt = ".conf"; // Display OpenFileDialog by calling ShowDialog method bool?result = dlg.ShowDialog(); // Get the selected file name and display in a TextBox if (result == true) { try { builder.LoadSettings(dlg.FileName); _reportItems = new ObservableCollection <ReportItem>(builder.ReportItems); } catch (Exception e) { MessageBoxWrapper.Show(e.Message); } OnPropertyChanged("ReportItems"); } }