A node topology represents a group of related points. Node topologies are often used as part of network or polygon topologies, to represent the endpoints of the links in the topology.
TopologyModel.GetNodes() returns the collection of nodes. For each node, Node.Entity returns the associated drawing object. If the node does not have a drawing object associated with it, Node.Entity throws a MapException.
Do not update items in a NodeCollection object using methods like Add(), Insert(), and Remove(). Instead, call the appropriate methods for the TopologyModel object, like AddPointObject().
Call NodeCollection.Dispose() when the object is no longer needed.