public void Add(ShortenedUrl url)
 {
     using (var context = new UrlShortenerContext(_connectionString))
     {
         context.ShortenedUrls.Add(url);
         context.SaveChanges();
     }
 }
        public async Task <ShortenedUrl> Insert(string url)
        {
            var entityToInsert = new ShortenedUrl
            {
                Url = url
            };

            await _shortenedUrls.InsertOneAsync(entityToInsert);

            return(entityToInsert);
        }