' Adds new node as a child node of the currently selected node.
Dim newNode As TreeNode = New TreeNode("Text for new node")
TreeView1.SelectedNode.Nodes.Add(newNode)

// Adds new node as a child node of the currently selected node.
TreeNode newNode = new TreeNode("Text for new node");
treeView1.SelectedNode.Nodes.Add(newNode);

// Adds new node as a child node of the currently selected node.
TreeNode newNode = new TreeNode("Text for new node");
treeView1.get_SelectedNode().get_Nodes().Add(newNode);

// Adds new node as a child node of the currently selected node.
TreeNode ^ newNode = new TreeNode("Text for new node");
treeView1->SelectedNode->Nodes->Add(newNode);

' Removes currently selected node, or root if nothing is selected.
TreeView1.Nodes.Remove(TreeView1.SelectedNode)
' Clears all nodes.
TreeView1.Nodes.Clear()

// Removes currently selected node, or root if nothing 
// is selected.
treeView1.Nodes.Remove(treeView1.SelectedNode);
// Clears all nodes.
TreeView1.Nodes.Clear();

// Removes currently selected node, or root if nothing 
// is selected.
treeView1.get_Nodes().Remove(treeView1.get_SelectedNode());

// Removes currently selected node, or root if nothing
// is selected.
treeView1->Nodes->Remove(treeView1->SelectedNode);
// Clears all nodes.
treeView1->Nodes->Clear();