Tree of business objects in C#

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C#

ASP.NET

Hi there!

I need to find out effective solution about one detail in my project.

I have a tree of categories and artefacts(or products). Category can consists of other categories or products. How to organize business logic for these objects?

My solution is here:

<pre>public class CategoryBO
    {
        public int CategoryID { get; set; }
        public string Name { get; set; }
        public List<CategoryBO> Categories { get; set; }
        public List<ArtefactBO> Artefacts { get; set; }
    }

One my friend sugests me to use the property for parent:

<pre>public class CategoryBO
    {
        public int CategoryID { get; set; }
        public string Name { get; set; }
        public CategoryBO Parent { get; set; }
        public List<CategoryBO> Categories { get; set; }
        public List<ArtefactBO> Artefacts { get; set; }
    }

Which way is more effective or may be you know more flexible trick for this issue?