ArrayList x=new ArrayList();
x.Add(10);
x.Add("SS");

IEnumerator enumerator = (x).GetEnumerator();
try {
   while (enumerator.MoveNext()) {
      string element = (string)enumerator.Current; // here is casting occures
      // loop body;
   }
}
finally {
   IDisposable disposable = enumerator as System.IDisposable;
   if (disposable != null) disposable.Dispose();
}