#2.5 Usings and Enumerators

One more thing regrading using. Do not forget, that IEnumerator<T> is IDisposable (though, IEnumerator is not).

public interface IEnumerator<T> : IDisposable, IEnumerator
{
  // Properties
  T Current { get; }
}


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So do not forget to enclose GetEnumerator() calls to using statement.