How to join int[] to a character separated string in .NET?

Question

I have an array of integers:

int[] number = new int[] { 2,3,6,7 };

What is the easiest way of converting these into a single string where

Answer 1

ints.Aggregate("", ( str, n ) => str +","+ n ).Substring(1);

I also thought there was a simpler way. Don't know about performance, anyone has any (theoretical) idea?