List.Add is changing existing members?

I'm using the .Add() method of the .NET List to add new members. Trouble is, this seems to be changing all existing members to be the same as the added one.

This a problem anyone has come across before?

Console screenshot

And here's the offending code, with my debug output code either side:

Code:

---

                System.Console.WriteLine("\nWhat I'm adding: ");
                System.Console.WriteLine(bufferCentroid.ToString());

                centroids.Add(bufferCentroid);

                System.Console.WriteLine("List contains: ");
                for (int k = 0; k < centroids.Count(); k++)
                {
                    System.Console.WriteLine(centroids[k].ToString());
                }

---

centroids.Add(bufferCentroid);
Simply adds a reference to the list, and since you're re-using the same reference, all items in the list point to the same object. What you want to do is actually create new objects (using new).

Aha!

Thanks.