1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:

        string AppPath = System.Configuration.ConfigurationManager.AppSettings["AppFolder"].ToString();
        string strPhysicalApplicationPath = AppPath;
        if (!Page.IsCallback || !Page.IsPostBack)
            #region MultimediaPanel        
            TreeViewDirectory.Visible = true;
            TreeViewDirectory.Nodes.Clear();
            String[] astrMediaDirs = Directory.GetDirectories(strPhysicalApplicationPath + "Multimedia-Archiv");

            TreeViewDirectory.Nodes.Add(new TreeNode("Archiv"));
            string et;
            for (int x = 0; x < astrMediaDirs.Length; x++)
            {
                et = System.IO.Path.GetFileNameWithoutExtension(astrMediaDirs[x]);
                TreeNode directoryNode = new TreeNode(et);
                String[] files = Directory.GetFiles(astrMediaDirs[x]);
                string st;
                for (int y = 0; y < files.Length; y++)
                {
                    // Name der Datei ohne Extension ermitteln
                    st = System.IO.Path.GetFileNameWithoutExtension(files[y]);
                    // Name in Legende (TreeNode) schreiben
                    directoryNode.ChildNodes.Add(new TreeNode(st));                    
                }
                TreeViewDirectory.Nodes.Add(directoryNode);
                TreeViewDirectory.CollapseAll();
            }
            #endregion