PageableImageControlViewModel_5.cs

private bool _canPageNext;

/// <summary>
/// Gets or sets a value indicating whether move to the next page.
/// </summary>
/// <value>
/// <c>true</c> if you can move to the next page; otherwise, <c>false</c>.
/// </value>
public bool CanPageNext
{
    get { return _canPageNext; }
    set
    {
        if (_canPageNext != value)
        {
            _canPageNext = value;
            OnPropertyChanged();
        }
    }
}

private ICommand _pageNextCommand;

/// <summary>
/// Gets the page next command.
/// </summary>
/// <value>
/// The page next command.
/// </value>
public ICommand PageNextCommand
{
    get
    {
        return _pageNextCommand ??
               (_pageNextCommand = new RelayCommand(PageNext, () => CanPageNext));
    }
}

private void PageNext()
{
    CurrentPage++;
    PageableImages.Reset(GetImages());
    CanPageNext = _images.Count > (CurrentPage + 1)*PageSize;
    CanPagePrevious = true;
    OnPropertyChanged("PageableImages");
}