public VLecturer FindByLecNationalCode(string username, string password, string lecnationalcode) { WebServiceAccountsRepository webir = new WebServiceAccountsRepository(); WebServiceAccount currentuser = webir.FindByUserName(username); if (currentuser != null) { if (currentuser.Password == password) { VLecturersRepository depir = new VLecturersRepository(); return(depir.FindBynationalcode(lecnationalcode)); } else { return(null); } } else { return(null); } }