Populating TreeView with Data From Database Using Entity Framework

Hello,

Please, i am still new to entity framework/LINQ and i have this challenge. I have also done some research to see if i could find any example related to mine, but couldn't.

I am working with treeview on Winforms and i want to load data from the database. I have a default root node already from the controls. And now, when i try adding a child node and fetching the data from the database, it creates two new root node and even the data in it is also wrong.

So far, this is the code i have which i have been trying for 2days now. Any help would be sincerely appreciated.

 private void RefreshTree()
        {
            using (Practise2Entities db = new Practise2Entities())
            {
                var q = (from i in db.qm_tree
                         group i by i.created into grpDate
                         select grpDate);

                foreach (var item in q)
                {
                    TreeNode nodes = new TreeNode(q.ToString());    //Create root node first
                    TreeNode tn = item as TreeNode;

                    var childNodes = q;
                    foreach (var child in childNodes)        //Adding child nodes to root node if it have any
                    {
                        TreeNode childNode = new TreeNode(q.ToString());
                        nodes.Nodes.Add(childNode);
                    }
                    DashBoard.fromDash.treeView1.Nodes.Add(nodes);
                }
            }
            
        }

I want to have one root node(which is already default), then child nodes and sub nodes...etc

Please, how can i achieve this?