# Adding and Removing Nodes

## Adding Nodes

RadTreeView nodes are arranged in a hierarchical structure. To add a node to the first level in a **RadTreeView** use the **Nodes.Add()** method. To add a child node to another node use the parent nodes **Nodes.Add()** method. **Nodes.Add()** places the node at the end of the **Nodes** collection. You may also use **Nodes.Insert()** to place the node anywhere in the **Nodes** collection.

The following example demonstrates how to add nodes using code:

```C#
private void AddNodes()
{
    RadTreeNode Node1 = new RadTreeNode("Node1");
    Node1.Tag = 1234;
    Node1.BackColor = Color.Blue;
    RadTreeNode Node2 = new RadTreeNode("Node2");
    RadTreeNode Node3 = new RadTreeNode("Node3");
    RadTreeNode Node4 = new RadTreeNode("Node4");
    radTreeView1.Nodes.Add(Node1);
    radTreeView1.Nodes.Add(Node2);
    Node1.Nodes.Add(Node3);
    Node2.Nodes.Add(Node4);
    //Alternative methods for adding nodes
    //RadTreeNode Node1 = radTreeView1.Nodes.Add("Node1");
    //RadTreeNode Node2 = radTreeView1.Nodes.Add("Node2");
    //Node1.Nodes.Add("Node3");
    //Node2.Nodes.Add("Node4");
}
```

```VB.NET
Private Sub AddNodes()
    Dim Node1 As New RadTreeNode("Node1")
    Node1.Tag = 1234
    Node1.BackColor = Color.Blue
    Dim Node2 As New RadTreeNode("Node2")
    Dim Node3 As New RadTreeNode("Node3")
    Dim Node4 As New RadTreeNode("Node4")
    RadTreeView1.Nodes.Add(Node1)
    RadTreeView1.Nodes.Add(Node2)
    Node1.Nodes.Add(Node3)
    Node2.Nodes.Add(Node4)
    'Alternative methods for adding nodes
    'RadTreeNode Node1 = radTreeView1.Nodes.Add("Node1");
    'RadTreeNode Node2 = radTreeView1.Nodes.Add("Node2");
    'Node1.Nodes.Add("Node3");
    'Node2.Nodes.Add("Node4");
End Sub
```

Just before a node is added, the  **NodeAdding** event is fired. The event arguments of this event allow you to cancel the adding of the node. If the operation was not canceled, then the node will be added to the RadTreeView and the  **NodeAdded** event will be fired. The following code snippet demonstrates the usage of these events:

```C#
void radTreeView1_NodeAdding(object sender, RadTreeViewCancelEventArgs e)
{
    if (e.Node.Text.Contains("Non-insertable"))
    {
        e.Cancel = true;
    }
}


void radTreeView1_NodeAdded(object sender, RadTreeViewEventArgs e)
{
    RadMessageBox.Show("Node {" + e.Node.Text + "} was added");
}

```

```VB.NET
Private Sub RadTreeView1_NodeAdding(sender As Object, e As RadTreeViewCancelEventArgs) Handles RadTreeView1.NodeAdding
    If e.Node.Text.Contains("Non-insertable") Then
        e.Cancel = True
    End If
End Sub

Private Sub RadTreeView1_NodeAdded(sender As Object, e As RadTreeViewEventArgs) Handles RadTreeView1.NodeAdded
    RadMessageBox.Show("Node {" + e.Node.Text + "} was added")
End Sub

```

## Removing Nodes

To remove a single node use the **Remove()** method of the node. To remove all nodes of the RadTreeView use the **Nodes.Clear()** method.

```C#
private void RemoveNodes()
{
    //Remove a single node
    radTreeView1.Nodes[0].Remove();
    // removes all nodes from TreeView
    radTreeView1.Nodes.Clear();
}
```

```VB.NET
Private Sub RemoveNodes()
    'Remove a single node
    RadTreeView1.Nodes(0).Remove()
    ' removes all nodes from TreeView
    RadTreeView1.Nodes.Clear()
End Sub
```

Just before a node is removed, the **NodeRemoving** event is fired. The event arguments of this event allow you to cancel the remove operation. If the operation was not canceled, then the node will be removed from RadTreeView and the **NodeRemoved** event will be fired. The following code snippet demonstrates the usage of these events:

```C#
void radTreeView1_NodeRemoving(object sender, RadTreeViewCancelEventArgs e)
{
    if (e.Node.Text.Contains("Unremovable"))
    {
        e.Cancel = true;
    }
}

void radTreeView1_NodeRemoved(object sender, RadTreeViewEventArgs e)
{
    RadMessageBox.Show("Node {" + e.Node.Text + "} was removed");
}

```

```VB.NET
Private Sub RadTreeView1_NodeRemoving(sender As Object, e As RadTreeViewCancelEventArgs) Handles RadTreeView1.NodeRemoving
    If e.Node.Text.Contains("Unremovable") Then
        e.Cancel = True
    End If
End Sub

Private Sub RadTreeView1_NodeRemoved(sender As Object, e As RadTreeViewEventArgs) Handles RadTreeView1.NodeRemoved
    RadMessageBox.Show("Node {" + e.Node.Text + "} was removed")
End Sub

```

## See Also

* [Bring a Node into View](https://www.telerik.com/products/winforms/documentation/controls/treeview/working-with-nodes/bring-a-node-into-view)

* [Custom Filtering](https://www.telerik.com/products/winforms/documentation/controls/treeview/working-with-nodes/custom-filtering)

* [Custom Nodes](https://www.telerik.com/products/winforms/documentation/controls/treeview/working-with-nodes/custom-nodes)

* [Custom Sorting](https://www.telerik.com/products/winforms/documentation/controls/treeview/working-with-nodes/custom-sorting)

* [Events](https://www.telerik.com/products/winforms/documentation/controls/treeview/working-with-nodes/events)

* [Filtering Nodes](https://www.telerik.com/products/winforms/documentation/controls/treeview/working-with-nodes/filtering-nodes)