Sets the enumerator to its initial position, which is before the first element in the System.Security.Cryptography.X509Certificates.X509Certificate2Collection object.
An enumerator remains valid as long as the collection remains unchanged. If changes are made to the collection, such as adding, modifying or deleting elements, the enumerator is irrecoverably invalidated and the next call to the X509Certificate2Enumerator.MoveNext or X509Certificate2Enumerator.Reset method throws an InvalidOperationException.