The Index property retrieves the node's index. The index of the node is allocated by the control when adding to the Nodes collection using the Add method. A node can be identified by its index or by its key. Use the Count property to indicate the number of nodes in the collection. Use the Item property to access a node by its index or by its key. Use the Root property to access the root node. Use the Key property to access the node's key. The Position property specifies the position of the node. Use the FirstNode property to get the first child node. Use the NextNode property to determine the next sibling node. Use the NodeCount property to get the number of child nodes.