Sets the enumerator to its initial position, which is before the first element in the collection.
Assembly: msmgdsrv (in msmgdsrv.dll)
The collection has changed, invalidating the enumerator.
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 MoveNext or throws an InvalidOperationException.