for example in this one:

http://www.visualwebgui.com/Home/Introduction/tabid/314/Default.aspx

there is a mahtod code:

        private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
        {
            this.listView1.Items.Clear();

            DirectoryInfo objDir = new DirectoryInfo((string)e.Node.Tag);
            foreach (FileInfo objFile in objDir.GetFiles())
            {
                ListViewItem objItem = listView1.Items.Add(objFile.Name);
                objItem.SubItems.Add(objFile.Length.ToString());
                objItem.Tag = objFile.FullName;
                objItem.Image = new IconResourceHandle("file.gif");
            }
        }
the last line is not still work now , it mast change to :

 objItem.SmallImage = new IconResourceHandle("file.gif");

I must say your videos is very good for us (beginners).

I'm sorry I have not examine all the videos, I can't point all which is need to update.

(I'm not a english_man, my english is bad)