public bool studentHasActivities(string phoneNumber, long roomId)
{
List <AnswerByPhoneData> answersData = AnswersByPhone.Where(record => record.Phone == phoneNumber && record.RoomID == roomId).ToList();
if (answersData.Count != 0)
{
return(true);
}
return(false);
}
public void DeleteAllActivitiesOfStudent(string phoneNumber, long roomID)
{
List <AnswerByPhoneData> answersData = AnswersByPhone.Where(record => record.Phone == phoneNumber && record.RoomID == roomID).ToList();
foreach (AnswerByPhoneData answer in answersData)
{
answer.RoomID = -1;
}
SaveChanges();
}