public bool AddAwardToUser(int userID, int awardID)
{
if (userID < 1 || awardID < 1)
{
throw new ArgumentException("ID can't be less than 1");
}
if (!userDao.Contains(userID))
{
throw new ArgumentException("Can't find user with such ID");
}
if (!awardDao.Contains(awardID))
{
throw new ArgumentException("Can't find award with such ID");
}
if (userDao.AddUserAward(userID, awardID))
{
return(true);
}
throw new InvalidOperationException("on user's award saving");
}
