web页面建立目录浏览器

浏览整个服务器的目录：protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            foreach (System.IO.DriveInfo drive in DriveInfo.GetDrives())
            {
                TreeNode node = new TreeNode();
                node.Value = drive.Name;
                if (drive.IsReady)
                {
                    node.Text = drive.Name + "  free";
                    LoadDirectories(node, drive.Name);
                }
                else
                    node.Text = drive.Name + "   not ready";
                this.TreeView1.Nodes.Add(node);
            }
        }
        this.TreeView1.CollapseAll();

    }
    private void LoadDirectories(TreeNode parent, string path)
    {
        DirectoryInfo directory = new DirectoryInfo(path);
        try
        {
            foreach (DirectoryInfo d in directory.GetDirectories())
            {
                TreeNode node = new TreeNode(d.Name, d.FullName);
                parent.ChildNodes.Add(node);
                LoadDirectories(node, d.FullName);
            }

        }
        catch (System.UnauthorizedAccessException e)
        {
            parent.Text += " (Acess Denied)";
        }
        catch (IOException e)
        {
            parent.Text += "(UNknown error:" + e.Message + ")";
        }
    }