public bool Authenticate(string username, string password, User user)
        {
            if (user == null)
            {
                return false;
            }

            bool valid = user.Password == password;
            if(valid){
                FormsAuthentication.SetAuthCookie(username+"|"+user.Id, false);
            }

            return valid;
        }
 public void CreateUser(User user)
 {
     context.Users.Add(user);
     context.SaveChanges();
 }