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 string[] directoryArray = Directory.GetDirectories(directoryValue);

            try
            {
                if (directoryArray.Length != 0)
                {
                    foreach (string directory in directoryArray)
                    {
                        substringdirectory = directory.Substring(directory.LastIndexOf('\\') + 1, directory.Length - directory.LastIndexOf('\\') - 1);

                        TreeNode myNode = new TreeNode(substringdirectory);
                       
                        parentNode.Nodes.Add(myNode);
                        PopulateTreeView(directory, myNode);
                    }
                }
            }                    

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CustomFolderBrowserDialog customfolderbrowserdialog = new CustomFolderBrowserDialog();
            
            if (customfolderbrowserdialog.ShowDialog() != DialogResult.OK)
            {
                MessageBox.Show("You have canceled the File Selection", "Notification", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return null;
            }
            return customfolderbrowserdialog.; //Hier fehlt mir die idee.....