Advances the enumerator to the next element of the collection.
Assembly: System.AddIn.Contract (in System.AddIn.Contract.dll)
The collection was modified after the enumerator was created.
After an enumerator is created or after the Reset method is called, an enumerator is positioned before the first element of the collection. The first call to the method moves the enumerator to the first element of the collection.
If passes the end of the collection, the enumerator is positioned after the last element in the collection and returns false. When the enumerator is at this position, subsequent calls to also return false until Reset is called.
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 or Reset throws an InvalidOperationException.