private string GetNextFileName(string fileName) {

            string extension = Path.GetExtension(fileName);

            string pathName = Path.GetDirectoryName(fileName);

            string fileNameOnly = Path.Combine(pathName, Path.GetFileNameWithoutExtension(fileName));

            int i = 0;

            // If the file exists, keep trying until it doesn't

            while (File.Exists(fileName)) {

                i += 1;

                fileName = string.Format("{0}({1}){2}", fileNameOnly, i, extension);

            }

            return fileName;

        }