I have a class that I wrote in C# which has several properties, including a list of the same class that I created. What I'm trying to do is pull out data from a cache and store it as a list of my class. The problem arises in that there is a relationship between the root nodes and child nodes (lets call it "id"). I'm basically trying to mimic a relationship between two datatables using a key, but I can't figure out how to do that with classes. Can anyone help me out? Thanks in advance.

You're going to need to setup another field, maybe called ParentID, which would hold the ID value for the container.  You'd use the same concept in a database table to setup a recursive relationship. 

 Your're trying to build a tree like structure? There's a design pattern to do this called composite. Here's an excellent article about it:

http://www.dofactory.com/Patterns/PatternComposite.aspx 

I generally do something like:

class Foo
{
    String Name{get;set;}
    Int32 Id{get; set;}
    IEnumerable<Foo> Children {get; set;}
}

What you're describing is a simplification of the Composite pattern. You'd better take a look at the link on my last post. It will be very useful to you.