The end goal is to have some form of a data structure that stores a hierarchal structure of a directory to be stored in a txt file.

I'm using the following code and so far, and I'm struggling with combining dirs, subdirs, and files.

/// <summary>
/// code based on http://msdn.microsoft.com/en-us/library/bb513869.aspx
/// </summary>
/// <param name="strFolder"></param>
public static void TraverseTree ( string strFolder )
{
  // Data structure to hold names of subfolders to be
  // examined for files.
  Stack<string> dirs = new Stack<string>( 20 );

  if ( !System.IO.Directory.Exists( strFolder ) )
  {
    throw new ArgumentException();
  }
  dirs.Push( strFolder );

  while ( dirs.Count > 0 )
  {
    string currentDir = dirs.Pop();
    string[] subDirs;
    try
    {
      subDirs = System.IO.Directory.GetDirectories( currentDir );
    }

    catch ( UnauthorizedAccessException e )
    {
      MessageBox.Show( "Error: " + e.Message );
      continue;
    }
    catch ( System.IO.DirectoryNotFoundException e )
    {
      MessageBox.Show( "Error: " +  e.Message );
      continue;
    }

    string[] files = null;
    try
    {
      files = System.IO.Directory.GetFiles( currentDir );
    }

    catch ( UnauthorizedAccessException e )
    {
      MessageBox.Show( "Error: " +  e.Message );
      continue;
    }

    catch ( System.IO.DirectoryNotFoundException e )
    {
      MessageBox.Show( "Error: " + e.Message );
      continue;
    }
    // Perform the required action on each file here.
    // Modify this block to perform your required task.
    /*
    foreach ( string file in files )
    {
      try
      {
        // Perform whatever action is required in your scenario.
        System.IO.FileInfo fi = new System.IO.FileInfo( file );
        Console.WriteLine( "{0}: {1}, {2}", fi.Name, fi.Length, fi.CreationTime );
      }
      catch ( System.IO.FileNotFoundException e )
      {
        // If file was deleted by a separate application
        //  or thread since the call to TraverseTree()
        // then just continue.
        MessageBox.Show( "Error: " +  e.Message );
        continue;
      }
    } 
    */

    // Push the subdirectories onto the stack for traversal.
    // This could also be done before handing the files.
    foreach ( string str in subDirs )
      dirs.Push( str );

    foreach ( string str in files )
      MessageBox.Show( str );
  }