C#

private void createTree()
  {
     g_ReportsFolder = Directory.GetCurrentDirectory() + "\\Reports2";
     ReportTree rtree = new ReportTree(g_ReportsFolder);
        foreach (ReportNode rNode in rtree.Nodes)
           {
               this.tvReports2.Nodes.Add(rNode);
            }

  }

public class ReportTree : TreeView
    {
        private string ReportsFolder = "";
        private DirectoryInfo Directory = null;

        public ReportTree(string p_ReportsFolder)
        {
            ReportsFolder = p_ReportsFolder;
            Directory = new DirectoryInfo(ReportsFolder);
            createTree(Directory);
            string s = this.Name;
        }

        private void createTree(DirectoryInfo p_Directory)
        {
            DirectoryInfo l_DirctoryInfo = null; 
            //Lookout for the children of the Directory
            foreach (FileSystemInfo Report in p_Directory.GetFileSystemInfos())
            {
                if (isDirectory(Report))
                {
                    createDirectoryNode(Report);
                    l_DirctoryInfo = new DirectoryInfo(Report.FullName);
                    createTree(l_DirctoryInfo);
                }
                else if (isXLSFile(Report))
                {
                    createFileNode(Report);
                }
                else
                {
                    continue;
                }
            }
        }

        private bool isDirectory(FileSystemInfo p_FSI)
        {
            if (p_FSI.Attributes == FileAttributes.Directory)
                return true;
            else
                return false;
        }

        private bool isXLSFile(FileSystemInfo p_FSI)
        {
            if (p_FSI.Attributes == FileAttributes.Archive && p_FSI.Extension == ".xls")
                return true;
            else
                return false;
        }

        private void createDirectoryNode(FileSystemInfo p_DirInfo)
        {
            string l_Text = p_DirInfo.Name;
            string l_Name = p_DirInfo.Name.Replace(" ", "").Replace("'", "").Trim();
            string l_Path = p_DirInfo.FullName;

            //Create a new Report Node (Customization of the tree node class)            
            this.Nodes.Add(new ReportNode(true, l_Name, l_Text, l_Path));
        }

        private void createFileNode(FileSystemInfo p_FileInfo)
        {
            string l_Text = p_FileInfo.Name.Remove(p_FileInfo.Name.IndexOf(".xls"));
            string l_Name = l_Text.Replace(" ", "").Replace("'", "").Trim();
            string l_Path = p_FileInfo.FullName;
            
            //Create a new Report Node (Customization of the tree node class)
            this.Nodes.Add(new ReportNode(false, l_Name, l_Text, l_Path));
        }
    }

public class ReportNode : TreeNode
    {        
        public bool isDirectory;        
        public string NodeName;
        public string NodeText;
        public string NodePath;
        
        public ReportNode(bool p_isDirectory, string p_Name, string p_Text, string p_Path)
        {
            this.isDirectory = p_isDirectory;
            this.NodeName = p_Name;
            this.NodeText = p_Text;
            this.NodePath = p_Path;

            //adding data to the base (tree Node) because .NET doesn't not to pick up the attributes and override them
            this.Text = this.NodeText;
            this.Name = this.NodeName;
        }
    }