Saving content of a treeview to a file and load it later

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You can use BinaryFormatter to Serialize/Deserialize Nodes

    public static void SaveTree(TreeView tree, string filename)
    {
        using (Stream file = File.Open(filename, FileMode.Create))
        {
            BinaryFormatter bf = new BinaryFormatter();
            bf.Serialize(file, tree.Nodes.Cast<TreeNode>().ToList());
        }
    }

    public static void LoadTree(TreeView tree, string filename)
    {
        using (Stream file = File.Open(filename, FileMode.Open))
        {
            BinaryFormatter bf = new BinaryFormatter();
            object obj = bf.Deserialize(file);

            TreeNode [] nodeList = (obj as IEnumerable<TreeNode>).ToArray();
            tree.Nodes.AddRange(nodeList);
        }
    }

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