Populate WinForms TreeView from DataTable

Question

I have a WinForm TreeView Control that displays the Parent Child relationship of CaseNotes(I know that means nothing to most of you but it helps me visualize the answers).

Answer 1

I've created much simplier extension method for TreeView, involving use of new simple extending class that adds two useful properties to TreeNode.

    internal class IdNode : TreeNode
    {
        public object Id { get; set; }
        public object ParentId { get; set; }
    }

    public static void PopulateNodes(this TreeView treeView1, DataTable dataTable, string name, string id, string parentId)
    {
        treeView1.BeginUpdate();
        foreach (DataRow row in dataTable.Rows)
        {
            treeView1.Nodes.Add(new IdNode() { Name = row[name].ToString(), Text = row[name].ToString(), Id = row[id], ParentId = row[parentId], Tag = row });
        }
        foreach (IdNode idnode in GetAllNodes(treeView1).OfType())
        {
            foreach (IdNode newparent in GetAllNodes(treeView1).OfType())
            {
                if (newparent.Id.Equals(idnode.ParentId))
                {
                    treeView1.Nodes.Remove(idnode);
                    newparent.Nodes.Add(idnode);
                    break;
                }
            }
        }
        treeView1.EndUpdate();
    }

    public static List GetAllNodes(this TreeView tv)
    {
        List result = new List();
        foreach (TreeNode child in tv.Nodes)
        {
            result.AddRange(GetAllNodes(child));
        }
        return result;
    }
    public static List GetAllNodes(this TreeNode tn)
    {
        List result = new List();
        result.Add(tn);
        foreach (TreeNode child in tn.Nodes)
        {
            result.AddRange(GetAllNodes(child));
        }
        return result;
    }

Thanks to the modiX for his methods to get all (nested) nodes.