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

In my C# WinForms program I have a treeview that only contains parent nodes (so, no childs) it is like a listbox but I needed it because of haveing differet properties of nodes like Name, Tag and Text.

No I want to be able to save the content of this treeview into a file (Basically a text file which I call it *.MVIA). The question is what is the best way to save all three properties of nodes in a file so it can loaded again later properly?

At the moment I came with this idea :

    private void menuFileSave_Click(object sender, EventArgs e)
    {
        StringBuilder sb = new StringBuilder();

        foreach(TreeNode node in treeViewFiles.Nodes)
        {
            sb.AppendLine(node.Name);
        }

        SaveFileDialog saveList = new SaveFileDialog();

        saveList.DefaultExt = "*.mvia";
        saveList.Filter = "MVIA Files|*.mvia";

        if (saveList.ShowDialog() == DialogResult.OK)
        {
            File.WriteAllText(saveList.FileName, sb.ToString());
        }            
    }

As you can see, each Name property of each node will be saved in a line. Now I need to add its Text and Tag property also, but later I have trouble reading it back (Honestly I don't know how to).

Would you give me some ideas what is a best way to save all three property of each node and be able to load it easily later?

Thanks.