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How to: Add and Remove Nodes with the Windows Forms TreeView Control
03/30/2017
.net-framework
dotnet-winforms
article
jsharp
examples [Windows Forms], TreeView control
TreeView control [Windows Forms], removing nodes
tree nodes in TreeView control
TreeView control [Windows Forms], adding nodes
de1b82db-4905-449a-9f59-af271a6b6673
16
dotnet-bot
dotnetcontent
wpickett

How to: Add and Remove Nodes with the Windows Forms TreeView Control

The Windows Forms xref:System.Windows.Forms.TreeView control stores the top-level nodes in its xref:System.Windows.Forms.TreeView.Nodes%2A collection. Each xref:System.Windows.Forms.TreeNode also has its own xref:System.Windows.Forms.TreeNode.Nodes%2A collection to store its child nodes. Both collection properties are of type xref:System.Windows.Forms.TreeNodeCollection, which provides standard collection members that enable you to add, remove, and rearrange the nodes at a single level of the node hierarchy.

To add nodes programmatically

  1. Use the xref:System.Windows.Forms.TreeNodeCollection.Add%2A method of the tree view's xref:System.Windows.Forms.TreeView.Nodes%2A property.

    ' 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->SelectedNode->Nodes->Add(newNode);  

To remove nodes programmatically

  1. Use the xref:System.Windows.Forms.TreeNodeCollection.Remove%2A method of the tree view's xref:System.Windows.Forms.TreeView.Nodes%2A property to remove a single node, or the xref:System.Windows.Forms.TreeNodeCollection.Clear%2A method to clear all nodes.

    ' 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->Nodes->Remove(treeView1->SelectedNode);  
    // Clears all nodes.  
    treeView1->Nodes->Clear();  

See Also

TreeView Control
TreeView Control Overview
How to: Set Icons for the Windows Forms TreeView Control
How to: Iterate Through All Nodes of a Windows Forms TreeView Control
How to: Determine Which TreeView Node Was Clicked
How to: Add Custom Information to a TreeView or ListView Control (Windows Forms)