[RESOLVED] TreeView -- Load nodes with multithreading

[winterslam]

I have a treeview control with 3 levels of nodes. Domains, users and folders.

When a node gets expanded, I want to load its children dynamically and simultaneously calculate the size of each child in a separate thread so that it will not freeze the GUI.

        public void treeView1_AfterExpand(object sender, TreeViewEventArgs e)
        {
            switch (e.Node.Level)  //Domain level
            {
                case 0:  

                    string domin = e.Node.Name;
                    List<string> userList = getUsers(domain);
		                      
                    foreach (string user in userList)
                    {
                                                
                        TreeNode temp = new TreeNode();
                        temp.Name = user
                        temp.Text = user + " (Calculating size) ";

                        ThreadContainer1 threadcontainer = new ThreadContainer1(e.Node, domain, user);
                        Thread thread1 = new Thread(new ThreadStart(threadcontainer.GetUserSize));
                        thread1.Start();

                        e.Node.Nodes.Add(temp);
                    }                    

                    break;

                case 1: //User level
		    string domain = e.Node.Parent.Name;
		    string user = e.Node.Name;
                   
                    List<string> folderList = getFolders(domain, user);

                    foreach (string folder in folders)
                    {
                       
                        TreeNode temp = new TreeNode();                        
                        temp.Name = folder;
			temp.Text = user + " (Calculating size) ";

			ThreadContainer2 threadcontainer = new ThreadContainer2(e.Node, domain, user, folder);
                        Thread thread1 = new Thread(new ThreadStart(threadcontainer.GetUFolderSize));
			thread1.Start();                        
                       
                        e.Node.Nodes.Add(temp);
                    }

                    break;

            }           

        }

Each thread is supposed to update the referenced node to display the corresponding size after calculating for a while.

However "Cross-thread operation not valid with threading" exception gets thrown whenever a thread tries to access the referenced node.

I googled the issue and found out about delegate.
http://www.shabdar.org/cross-thread-...not-valid.html

But the problem is that node is not a control. So it does not have Invoke() method.

Anyone knows how to solve this problem?