NavigationService Overview MainPageViewModel2

MainPageViewModel2.cs

private readonly INavigationService _navigationService;
public ICommand NavigateSecondCommand { get; }
public MainPageViewModel(INavigationService navigationService)
{
    _navigationService = navigationService;
    NavigateSecondCommand = new DelegateCommand(() =>
    {
        _navigationService.NavigateAsync("SecondPage");
    });
}