public static Staff CreateStaff(StaffType staffType)
        {
            switch (staffType)
            {
            case StaffType.teachingStaff:
                TeachingStaff teachingStaff = new TeachingStaff();
                AskCommonDetails(teachingStaff);
                teachingStaff.Subject       = InputStaffProperties.AskSubject();
                teachingStaff.AssignedClass = InputStaffProperties.AskClass();
                return(teachingStaff);

            case StaffType.administrativeStaff:
                AdminstrativeStaff adminStaff = new AdminstrativeStaff();
                AskCommonDetails(adminStaff);
                adminStaff.Post = InputStaffProperties.AskPost();
                return(adminStaff);

            case StaffType.supportStaff:
                SupportStaff supportStaff = new SupportStaff();
                AskCommonDetails(supportStaff);
                supportStaff.Post = InputStaffProperties.AskPost();
                return(supportStaff);

            default:
                return(null);
            }
        }
        public static void ViewDetails(Staff staff)
        {
            switch (staff.StaffType)
            {
            case StaffType.teachingStaff:
                TeachingStaff teachingStaff = (TeachingStaff)staff;
                ViewCommonDetails(teachingStaff);
                Console.WriteLine("\nSubject : {0}", teachingStaff.Subject);
                Console.WriteLine("Class Assigned: {0}", teachingStaff.AssignedClass);
                break;

            case StaffType.administrativeStaff:
                AdminstrativeStaff adminStaff = (AdminstrativeStaff)staff;
                ViewCommonDetails(adminStaff);
                Console.WriteLine("\nPost : {0}", adminStaff.Post);
                break;

            case StaffType.supportStaff:
                SupportStaff supportStaff = (SupportStaff)staff;
                ViewCommonDetails(supportStaff);
                Console.WriteLine("\nPost : {0}", supportStaff.Post);
                break;
            }
        }