Most Efficient Endless Loop In C# (carousel)

Assuming a list of objects, each with an ID, what's the most efficient way of building a carousel, so that each object knows what its previous and next item is. The Last Item's previousId will link to the first item. The first item's previousId will link to the last.

I need the ID of the previous and the ID of the next, as this will be used to populate next and previous buttons on a web page.

I know I could iterate over them, adding placeholders for _next and _prev id, but what's the most efficient way to do this?

I figure my object should look like this:

class Item {
public int Id { get; set; }
public string ItemName { get; set; }
public int Next { get; set; }[code]....

I think I'm looking at this wrong way. Is there a better way of doing this?