C#

public TreeNode FindPath(string path)
{
  if (path == null) throw new ArgumentNullException("path");
  string[] names = path.Split(PathSeparator);
  return FindPathHelper(Nodes, names, 0);
}
private TreeNode FindPathHelper(TreeNodeCollection nodes,
  string[] names, int iteration)
{
  if (nodes != null && names != null &&
      iteration >= 0 && iteration < names.Length)
  {
    foreach (TreeNode node in nodes)
    {
      if (string.Compare(node.Text, names[iteration], true) == 0)
        return node;
      TreeNode child = FindPathHelper(node.Nodes, names, ++iteration);
      if (child != null) return child;
    }
  }
  return null;
}