Private Sub PrintRecursive(ByVal n As TreeNode)
   System.Diagnostics.Debug.WriteLine(n.Text)
   MessageBox.Show(n.Text)
   Dim aNode As TreeNode
   For Each aNode In n.Nodes
      PrintRecursive(aNode)
   Next
End Sub

' Call the procedure using the top nodes of the treeview.
Private Sub CallRecursive(ByVal aTreeView As TreeView)
   Dim n As TreeNode
   For Each n In aTreeView.Nodes
      PrintRecursive(n)
   Next
End Sub

private void PrintRecursive(TreeNode treeNode)
{
   // Print the node.
   System.Diagnostics.Debug.WriteLine(treeNode.Text);
   MessageBox.Show(treeNode.Text);
   // Print each node recursively.
   foreach (TreeNode tn in treeNode.Nodes)
   {
      PrintRecursive(tn);
   }
}

// Call the procedure using the TreeView.
private void CallRecursive(TreeView treeView)
{
   // Print each node recursively.
   TreeNodeCollection nodes = treeView.Nodes;
   foreach (TreeNode n in nodes)
   {
      PrintRecursive(n);
   }
}

private void PrintRecursive(TreeNode treeNode) 
{
   // Print the node.
   System.Diagnostics.Debug.WriteLine(treeNode.get_Text());
   MessageBox.Show(treeNode.get_Text());
   for(int i = 0; i < treeNode.GetNodeCount(false); ++i) // Print each node recursively.
   {
      PrintRecursive(treeNode.get_Nodes().get_Item(i));
   }
}

// Call the procedure using the TreeView.
private void CallRecursive(TreeView treeView) 
{
   // Print each node recursively.
   TreeNodeCollection nodes = treeView.get_Nodes();
   for(int i = 0; i < nodes.get_Count(); ++i)
   {
      PrintRecursive(nodes.get_Item(i));
   }
}

private:
   void PrintRecursive( TreeNode^ treeNode )
   {
      // Print the node.
      System::Diagnostics::Debug::WriteLine( treeNode->Text );
      MessageBox::Show( treeNode->Text );
      
      // Print each node recursively.
      System::Collections::IEnumerator^ myNodes = (safe_cast<System::Collections::IEnumerable^>(treeNode->Nodes))->GetEnumerator();
      try
      {
         while ( myNodes->MoveNext() )
         {
            TreeNode^ tn = safe_cast<TreeNode^>(myNodes->Current);
            PrintRecursive( tn );
         }
      }
      finally
      {
         IDisposable^ disposable = dynamic_cast<System::IDisposable^>(myNodes);
         if ( disposable != nullptr )
                  disposable->Dispose();
      }
   }

   // Call the procedure using the TreeView.
   void CallRecursive( TreeView^ treeView )
   {
      // Print each node recursively.
      TreeNodeCollection^ nodes = treeView->Nodes;
      System::Collections::IEnumerator^ myNodes = (safe_cast<System::Collections::IEnumerable^>(nodes))->GetEnumerator();
      try
      {
         while ( myNodes->MoveNext() )
         {
            TreeNode^ n = safe_cast<TreeNode^>(myNodes->Current);
            PrintRecursive( n );
         }
      }
      finally
      {
         IDisposable^ disposable = dynamic_cast<System::IDisposable^>(myNodes);
         if ( disposable != nullptr )
                  disposable->Dispose();
      }
   }