BookMgnt.Controllers.AdminController.UpdateAccountRoles C# (CSharp) Method

        private void UpdateAccountRoles(int userId, List<Role> roles)
        {
            var user = db.Users.Include("Roles").Single(u => u.UserID == userId);

            user.Roles.Clear();

            foreach (var role in roles)
            {
                user.Roles.Add(role);
            }
            db.SaveChanges();
        }