Treeview node tags are strangely created

Question

I've got a treeview control with dynamically created node/ childnodes. When the user clicks on a particular node, a table display should be updated with some relevant node information/settings. To track which node is being clicked I added a custom tag (a class called 'NodeTag' containing two fields) to the node after it had been created run-time. I've subscribed to the 'AfterSelect' event of the treeview control and I'd like to check the SelectedNode.Tag but strangely I'd always got the last tag object for all selected objects: all nodes have NodeTag.Nodename = "GLBS" and NodeTag.NodeNumber = 0. Here is a pic, where 'Current Session' is selected, the selected node text is correct but the tag is not.

Here is the code:

TreeNode SessionNode = new TreeNode("Current Session");
            //Add Tag object to the new node
            NodeTag nt = new NodeTag();
            nt.NodeName = "SESS";
            nt.NodeNumber = 0;
            SessionNode.Tag = (object) nt;
            tv_project.Nodes.Add(SessionNode);


            MainProject.ProjectNode = new TreeNode("Project - " + e.ProjName + " - " + e.ProjOwner);
            //Add Tag object to the new node
            nt.NodeName = "PROJ";
            nt.NodeNumber = 0;
            MainProject.ProjectNode.Tag = (object) nt;
            SessionNode.Nodes.Add(MainProject.ProjectNode);


            TreeNode SettingsNode = new TreeNode("Global Settings");
            //Add Tag object to the new node
            nt.NodeName = "GLBS";
            nt.NodeNumber = 0;
            SettingsNode.Tag = (object) nt;
            SettingsNode.ForeColor = Color.Red;
            MainProject.ProjectNode.Nodes.Add(SettingsNode);

Answer 1

I have the solution!

You create an instance of NodeTag just at the first time, then you just modify it .
You have to create a separate nt for each node:

TreeNode SessionNode = new TreeNode("Current Session");
        //Add Tag object to the new node
        NodeTag nt = new NodeTag();
        nt.NodeName = "SESS";
        nt.NodeNumber = 0;
        SessionNode.Tag = (object) nt;
        tv_project.Nodes.Add(SessionNode);


        MainProject.ProjectNode = new TreeNode("Project - " + e.ProjName + " - " + e.ProjOwner);
        //Add Tag object to the new node
        NodeTag nt1 = new NodeTag();
        nt1.NodeName = "PROJ";
        nt1.NodeNumber = 0;
        MainProject.ProjectNode.Tag = (object) nt1;
        SessionNode.Nodes.Add(MainProject.ProjectNode);


        TreeNode SettingsNode = new TreeNode("Global Settings");
        //Add Tag object to the new node
        NodeTag nt2 = new NodeTag();
        nt2.NodeName = "GLBS";
        nt2.NodeNumber = 0;
        SettingsNode.Tag = (object) nt2;
        SettingsNode.ForeColor = Color.Red;
        MainProject.ProjectNode.Nodes.Add(SettingsNode);