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 + ")";        }    }