Microsoft.VisualStudio.R.Package.ProjectSystem.PropertyPages.Settings.SettingsPageControl.OnSelectedFileChanged C# (CSharp) Method

        private void OnSelectedFileChanged(object sender, EventArgs e) {
            if (_selectedIndex != filesList.SelectedIndex) {
                if (IsDirty) {
                    var answer = _appShell.ShowMessage(Resources.SettingsPage_SavePrompt, MessageButtons.YesNoCancel);
                    if (answer == MessageButtons.Cancel) {
                        filesList.SelectedIndex = _selectedIndex;
                        return;
                    } else if (answer == MessageButtons.Yes) {
                        _viewModel.SaveAsync().DoNotWait();
                    }
                }
                _selectedIndex = filesList.SelectedIndex;
                IsDirty = true;
                LoadPropertyGrid();
            }
        }