Programmatically set navigation settings in SharePoint 2013

When Going to Site settings>Navigation for an subsite i want to modifie The Structural Navigation:Sorting to be the first value (Sort automatically)

I am trying to do this with my code,

ClientContext clientContext;
var navigation = new ClientPortalNavigation(clientContext.Web);
            navigation.CurrentIncludePages = true;
            navigation.GlobalIncludePages = false;
            navigation.OrderingMethod = OrderingMethod.Automatic; // Settings
            navigation.SaveChanges();

the The Structural Navigation:Sorting to be Automatic,( Sort automatically)

I have my code in an button so when pressing the button i want to set it to be automatic

I have also create a class by the name ClientPortalNavigation.cs My cs file looks like this,

public class ClientPortalNavigation
{
    public ClientPortalNavigation(Web web)
    {
        _web = web;
    }

    #region CRUD operations

    private void EnsureLoaded()
    {
        if (!_web.IsObjectPropertyInstantiated("AllProperties"))
        {
            Context.Load(_web, w => w.AllProperties);
            Context.ExecuteQuery();
        }
    }


    public void SaveChanges()
    {
        _web.Update();
        Context.ExecuteQuery();
    }

public bool GlobalIncludePages { get { return (GlobalIncludeTypes & NodeTypes.Page) == NodeTypes.Page; } set { GlobalIncludeTypes = !value ? GlobalIncludeTypes & ~NodeTypes.Page : GlobalIncludeTypes | NodeTypes.Page; } }

    /// <summary>
    /// Controls whether publishing pages in this site will be automatically included in current navigation.
    /// </summary>
    public bool CurrentIncludePages
    {
        get
        {
            return (CurrentIncludeTypes & NodeTypes.Page) == NodeTypes.Page;
        }
        set
        {
            CurrentIncludeTypes = !value ? CurrentIncludeTypes & ~NodeTypes.Page : CurrentIncludeTypes | NodeTypes.Page;
        }
    }

/// /// Options that specify how navigation items are ordered. /// public enum OrderingMethod { Automatic, ManualWithAutomaticPageSorting, Manual, } /// /// Controls the ordering of navigation items owned by this site. /// public OrderingMethod OrderingMethod { get { return (OrderingMethod)GetProperty("__NavigationOrderingMethod", 2); } set { SetProperty("__NavigationOrderingMethod", (int)value); } } }