public Guid Login(LoginModel user)
{
//using (var _context = new CustomDbContext())
//{
var users = _context.Users.FirstOrDefault(u => u.Username == user.Username);
if (users == null)
{
throw new ArgumentException();
}
if (PasswordHandler.Validate(user.Password, users.PasswordHash))
{
return(users.UserId);
}
return(Guid.NewGuid());
//}
}