hide top navigation child node in sharepoint 2013 using c#

Question

private void HideTopNavigation()

{

SPSecurity.RunWithElevatedPrivileges(delegate()

{

using (SPSite Osite = new SPSite(SPContext.Current.Site.ID))

{

using (SPWeb Oweb = Osite.OpenWeb())

{

SPNavigationNodeCollection topNavNodes = Oweb.Navigation.TopNavigationBar;

foreach (SPNavigationNode node in topNavNodes)

{

if (node.Title == "Org Browser")

{

if (node.Children.Count > 0)

{

foreach (SPNavigationNode childNode in node.Children)

{

if (childNode.Title == "Official")

{

childNode.IsVisible = false;

using (SPSite oSite = new SPSite(SPContext.Current.Site.Url + childNode.Url))

{

using (SPWeb ospWeb = oSite.OpenWeb())

{

ospWeb.AllowUnsafeUpdates = true;

PublishingWeb oPub = PublishingWeb.GetPublishingWeb(ospWeb);

oPub.IncludeInCurrentNavigation = false;

oPub.Update();

ospWeb.Update();

ospWeb.AllowUnsafeUpdates = false;

}

}

Oweb.AllowUnsafeUpdates = true;

childNode.Update();

Oweb.AllowUnsafeUpdates = false;

}

}

}

}

}

}

}

});

}

 

 

i use this for hide that but it not working