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);

   }

}