The System.Windows.Forms.TreeNode that was inserted in the collection.
If the TreeView.Sorted property is set to true, the index parameter value is ignored. The System.Windows.Forms.TreeNode is inserted into the tree view and the System.Windows.Forms.TreeView is sorted again.
You can also add new System.Windows.Forms.TreeNode objects to the collection by using the erload:System.Windows.Forms.TreeNodeCollection.Add or TreeNodeCollection.AddRange(TreeNode[]) methods.