public void ResetUsersFamily(CassandraColumnFamily userFamily = null) { userFamily = userFamily ?? UserFamily; var db = userFamily.Context; userFamily.RemoveAllRows(); foreach (var user in Users) { dynamic record = userFamily.CreateRecord(user.Id); if (toLower2) { record.name = user.Name; record.email = user.Email; record.age = user.Age; } else { record.Name = user.Name; record.Email = user.Email; record.Age = user.Age; } db.Attach(record); } db.SaveChanges(); }