I want to read subfolder.

Nice Answer Manoj Bhoir is correct 

public string[] GetSubFolder(string path)
  {
  List _subdirectoryList = new List();
  string[] _CurrentDirectoryList = System.IO.Directory.GetDirectories(path);
  _subdirectoryList.AddRange(_CurrentDirectoryList);
  foreach (string _directorypath in _CurrentDirectoryList)
  {
  _subdirectoryList.AddRange(GetSubFolder(_directorypath));
  }
  return _subdirectoryList.ToArray();
  }

My Blog

Hi, Check this example :

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            List _finaldirectoryList = new List();
            string[] _directoryList;
            _directoryList = System.IO.Directory.GetDirectories("Your Directory Path");
            _finaldirectoryList.AddRange(_directoryList);
            foreach (string _directorypath in _directoryList)
            {
                _finaldirectoryList.AddRange(GetSubFolder(_directorypath));
            }
            //_directoryList contains all subfolder paths
        }

        public string[] GetSubFolder(string path)
        {
            List _subdirectoryList = new List();
             string[] _CurrentDirectoryList = System.IO.Directory.GetDirectories(path);
             _subdirectoryList.AddRange(_CurrentDirectoryList);
             foreach (string _directorypath in _CurrentDirectoryList)
            {
                _subdirectoryList.AddRange(GetSubFolder(_directorypath));
            }
            return _subdirectoryList.ToArray();
        }
    }
}

You can use substring to extract folder name from list of paths.
I hope this will help you. :)

to read folder3

path="mainfolder/folder2/folder3/";

or

http://www.c-sharpcorner.com/code/616/get-list-of-directory-folder-with-path-in-project.aspx

Hi!

try like this..

string[] folders = System.IO.Directory.GetDirectories(@"C:\My Sample Path\","*", System.IO.SearchOption.AllDirectories);

folder3 is inside folder2  i think