[c#] how to list all sub directories in a directory

I'm working on a project and I need to list all sub directories in a directory for example how could I list all the sub directories in c:\

FolderBrowserDialog fbd = new FolderBrowserDialog();

        DialogResult result = fbd.ShowDialog();

        string[] files = Directory.GetFiles(fbd.SelectedPath);
        string[] dirs = Directory.GetDirectories(fbd.SelectedPath);

        foreach (string item2 in dirs)
        {
            FileInfo f = new FileInfo(item2);

            listBox1.Items.Add(f.Name);

        }

        foreach (string item in files)
        {
            FileInfo f = new FileInfo(item);

            listBox1.Items.Add(f.Name);

        }

Easy as this:

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

show all directry and sub directories

def dir():

from glob import glob

dir = []

dir = glob("path")

def all_sub_dir(dir):
{

     for item in dir:

            {
                b = "{}\*".format(item)
                dir += glob(b)
            }
         print(dir)
}

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace TRIAL
{
    public class Class1
    {
        static void Main(string[] args)
        {
           string[] fileArray = Directory.GetDirectories("YOUR PATH");
           for (int i = 0; i < fileArray.Length; i++)
           {

               Console.WriteLine(fileArray[i]);
           }
            Console.ReadLine();
        }
    }
}

To just get the simple list of folders without full path, you can use:

Directory.GetDirectories(parentDirectory).Select(d => Path.GetRelativePath(parentDirectory, d)