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//namespace reference
using System;
using System.IO;

/// <summary>
/// method for finding all the sub-directories for a given directory
/// </summary>
/// <param name="dir">directory to retrieve info for</param>
/// <returns></returns>
public Hashtable ListAllSubDirectories(string dir)
{
    //variable to hold our results
    Hashtable dirResults = new Hashtable();
    try
    {
        //get the root directory of the directory path provided
        Directory.GetDirectoryRoot(dir);
        //get the last location of a backslash ("\")
        int loc = dir.LastIndexOf('\\');
        //remove the last backslash
        dir = dir.Remove(loc, dir.Length - loc);
        //add the root to the HashTable
        dirResults.Add("Root Directory", dir);
        //create a string array to hold all the directories under the root
        string[] directories = Directory.GetDirectories(dir);
        foreach (string directory in directories)
        { 
            dirResults.Add("SubDirectory:",directory);
        }
    }
    catch (Exception ex)
    {
        dirResults = null;
        MessageBox.Show(ex.Message);
    }
    return dirResults;
}