how to select tree node by value?

hi guys,
i use this code to select a node in treeview by value but it's not work, what's wrong?
private void selectNodeByValue(TreeView tree, String value) { for (int i = 0; i < tree.Nodes.Count; i++) { foreach (TreeNode node in tree.Nodes) { if (node.Value == value) { node.Select(); node.Expand(); } } } }