How do I put the contents of a list in a single MessageBox?

Question

Basically, I have a list with multiple items in it and I want a single message box to display them all.

The closest I have got is a message box for each item (using

Answer 1

If you have .Net 4.0

string s = String.Join(",", list);

If you don't but have 3.5

string s = String.Join(",", list.ToArray());