Although this structure is public, it is rarely used explicitly. Instead you should use the foreach (or For Each) construct to iterate through the children of a group. In C#:

            foreach (GoObject obj in aGroup) {
              . . .
            }
            

In VB.NET:

            Dim obj As GoObject
            For Each obj in aGroup
              . . .
            Next
            

Also, since GoGroup implements the IList interface, you can refer to the items of the group by a zero-based index.

Remember that you must not modify the group collection, by adding, removing, or re-ordering the child objects, while you are iterating over the children. This structure type does not support comparison for equality.

Reference

GoGroupEnumerator Members
Northwoods.Go Namespace