public static string CreateTrailFileName(string semeterfileDirectory) { string[] splittedDirectory = semeterfileDirectory.Split('.'); int tracker = splittedDirectory.Count() - 1; semeterfileDirectory = null; for (int i = 0; i <= tracker; i++) { if (i != tracker) { if (semeterfileDirectory == null) { semeterfileDirectory = splittedDirectory[i]; } else { semeterfileDirectory = semeterfileDirectory + "." + splittedDirectory[i]; } } else { semeterfileDirectory = semeterfileDirectory + "T." + splittedDirectory[i]; } } //semeterfileDirectory = splittedDirectory[0]+splittedDirectory[1] + "T.txt"; DirectoryManager.CreateFile(semeterfileDirectory); return(semeterfileDirectory); }