private void btnClick_Click(object sender, EventArgs e)
{
	txtGetDirTree.Text = "";

	ftp1.Server = txtHost.Text;
	ftp1.Port = Convert.ToInt32(txtPort.Text);
	ftp1.UserName = txtUser.Text;
	ftp1.Password = txtPassword.Text;

	ftp1.Open();
	try
	{
		m_level = "";
		GetRecursiveList(txtRootDir.Text, "");
	}
	finally
	{					
		ftp1.Close();
		MessageBox.Show("Done");
	}
}

private void GetRecursiveList(string dirName, string level)
{
	string old = m_level;
	try
	{
		m_level += level;
		ftp1.ChangeCurrentDir(dirName);
		ftp1.GetDirectoryListing();
		ftp1.ChangeToParentDir();
	}
	finally
	{
		m_level = old;
	}
}

private void ftp1_DirectoryListing(object sender, DirectoryListingEventArgs e)
{
	txtGetDirTree.AppendText(m_level + e.FileInfo.FileName + "\r\n");
	if (e.FileInfo.IsDirectory)
	{
		GetRecursiveList(e.FileInfo.FileName, "\t");
	}
}