public async Task DeleteTodo(int id)
 {
     try
     {
         await _todoRepository.Delete(id);
     }
     catch (Exception e)
     {
         throw e;
     }
 }
        public async Task <ActionResult> Delete(string id)
        {
            var deleted = await repository.Delete(id);

            if (deleted)
            {
                await cache.Invalidate(id);

                return(Ok());
            }
            else
            {
                return(NotFound());
            }
        }