Compiler-generated code for a foreach loop using the iterator pattern.

foreach.cs

List<Person>.Enumerator e = people.GetEnumerator();
try
{
  Person v;
  while (e.MoveNext())
    v = e.Current;
}
finally
{
  System.IDisposable d = e as System.IDisposable;
  if (d != null) d.Dispose();
}