How to exclude sub sites in navigation from C# code

Hi,
I need show Global navigation items in custom web part, below code is returning global navigations with sub sites.
how to exclude sub sites and return only global navigation items links?
using (SPSite spsite = new SPSite(SPContext.Current.Web.Url))
using (SPWeb web = spsite.OpenWeb())
SPNavigationNodeCollection colletion = web.Navigation.TopNavigationBar;
foreach (SPNavigationNode navigationNode in colletion)
//Getting all global navigation nodes including sub sites
please help me to resolve this.
Thanks.

This should work
if(!web.isRootWeb){web.Navigation.GlobalNavigationNodes.Delete(navigationNode);web.Update()}
Refer to the following post for more information
http://www.learningsharepoint.com/2010/09/28/add-links-to-top-navigation-sharepoint-2010-programmatically/
--Cheers

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