using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using System.Configuration;
using System.Data;
using System.IO;
using System.Web.Security;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls.WebParts;
using System.Media;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;

namespace treeview_asp
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {


           /* getDrives();
            if (cDrives.Items.Count != 0)
                cDrives.Text = cDrives.Items[0].ToString();*/


            if (Page.IsPostBack == false)
            {
               // System.IO.DirectoryInfo RootDir = new System.IO.DirectoryInfo(Server.MapPath("~/"));
             // System.IO.DirectoryInfo RootDir = new System.IO.DirectoryInfo("C:\\Users\\SAYAK");
                System.IO.DirectoryInfo RootDir = new System.IO.DirectoryInfo("K:\\SilverlightApplication1");
                //System.IO.DriveInfo abcd = new System.IO.DriveInfo("k");
               // string[] name = Directory.GetDirectories("C:\\Users\\SAYAK\\Desktop");
               // System.IO.DirectoryInfo RootDir = new System.IO.DirectoryInfo(name[0]);
               
                
                // output the directory into a node
                TreeNode RootNode = OutputDirectory(RootDir, null);
              //  TreeNode RootNode = OutputDrive(abcd, null);

                // add the output to the tree

                MyTree.Nodes.Add(RootNode);

            }
        }

          TreeNode OutputDirectory(System.IO.DirectoryInfo directory, TreeNode parentNode)
    {
        // validate param
        if (directory == null) return null;

        // create a node for this directory

        TreeNode DirNode = new TreeNode(directory.Name);

        // get subdirectories of the current directory

        System.IO.DirectoryInfo[] SubDirectories = directory.GetDirectories();

       // OutputDirectory(SubDirectories[0], "Directories");

        // output each subdirectory

        for (int DirectoryCount = 0; DirectoryCount < SubDirectories.Length; DirectoryCount++)

        {

            OutputDirectory(SubDirectories[DirectoryCount], DirNode);

        }

        // output the current directories file

        System.IO.FileInfo[] Files = directory.GetFiles();

        for (int FileCount = 0; FileCount < Files.Length; FileCount++)

        {

            DirNode.ChildNodes.Add(new TreeNode(Files[FileCount].Name));

        }        // if the parent node is null, return this node

        // otherwise add this node to the parent and return the parent

        if (parentNode == null)

        {

            return DirNode;

        }

        else

        {

            parentNode.ChildNodes.Add(DirNode);

            return parentNode;
        }

        /*private void getDrives()
        {
            foreach (DriveInfo drive in DriveInfo.GetDrives())
            {
                if (drive.IsReady) //Check to see there is something in the drive
                   // cDrives.Items.Add(drive.RootDirectory);
                    DropDownList1.Items.Add("C:\\");
            }
        }*/


    }

  }

Is there other process to show the total hard disk tree view in web application?