public bool ValidateUser(UserDTO user) { int numberOfUser = 0; try { // count number of users that have same username and password numberOfUser = (int)tabUserAdapter.CountUser(user.UserName, user.Password); // log in is valid if there is a matched record if (numberOfUser != 0) { return(true); } } catch (SystemException e) { Console.WriteLine("Cannot connect to the database" + e.Message); } return(false); }