public static string formatForWrite(Student stIn)
 {
     if (stIn is FullTimeStudent)
     {
         FullTimeStudent fts = (FullTimeStudent)stIn;
         return($"F#{fts.getId()}#{fts.getFirstName()}#{fts.getLastName()}#{fts.getCampus()}");
     }
     else if (stIn is DistanceStudent)
     {
         DistanceStudent dts = (DistanceStudent)stIn;
         return($"D#{dts.getId()}#{dts.getFirstName()}#{dts.getLastName()}#{dts.getFacilitator()}");
     }
     else
     {
         return($"E#{stIn.getId()}");
     }
 }