How to count all the nodes of the WinForms TreeViewAdv?

In WinForms TreeViewAdv , the user could get the total number of nodes by calling GetNodeCount method with the bool argument which indicates whether count should be including sub trees or not. If we pass it as true, it will count the nodes with the subtrees also.

C#

private void button1_Click(object sender, System.EventArgs e)
{
   // Call the tree control's "GetNodeCount" method with true to
   // get the total number of nodes in the tree
   int TotalNodesInTree = this.treeViewAdv1.GetNodeCount( true );
   MessageBox.Show("Total nodes in tree = " + TotalNodesInTree.ToString());
}

//Add nodes
private void button2_Click(object sender, System.EventArgs e)
{
   this.treeViewAdv1.SelectedNode.Nodes.Add(new TreeNodeAdv());
}

//Remove nodes
private void button3_Click(object sender, System.EventArgs e)
{
   this.treeViewAdv1.SelectedNode.Parent.Nodes.Remove(this.treeViewAdv1.SelectedNode);
}

 VB.Net

Private Sub button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    ' Call the tree control's "GetNodeCount" method with true to
    ' get the total number of nodes in the tree
    Dim TotalNodesInTree As Integer = Me.treeViewAdv1.GetNodeCount(True)
    MessageBox.Show("Total nodes in tree = " & TotalNodesInTree.ToString())
End Sub

'Add nodes
Private Sub button2_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    Me.treeViewAdv1.SelectedNode.Nodes.Add(New TreeNodeAdv())
End Sub

'Remove nodes
Private Sub button3_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    Me.treeViewAdv1.SelectedNode.Parent.Nodes.Remove(Me.treeViewAdv1.SelectedNode)
End Sub