prs/prs.desktop/Panels/OrgChart/OrgChartEntries.cs

using System.Collections.ObjectModel;
using System.Linq;

namespace PRSDesktop
{
    public class OrgChartEntries : ObservableCollection<OrgChartEntry>
    {
        public bool IsChildOf(OrgChartEntry child, OrgChartEntry parent)
        {
            if (child == null)
                return false;
            if (parent == null)
                return false;
            if (parent == child)
                return true;
            return IsChildOf(this.FirstOrDefault(x => x.ID == child.ParentID), parent);
        }
    }
}