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 public static class MongoUnitOfWork
    {
        public static async Task Transaction(this IMongoDatabase database, Func<Task> commands)
        {
            if (database == null) throw new ArgumentNullException("database");

            var commited = false;

            var beginTransaction = new BsonDocument("beginTransaction", "true");
            await database.RunCommandAsync<BsonDocument>(beginTransaction);

            while (!commited)
            {
                try
                {
                    commands();
                    commited = true;
                    var commitTransaction = new BsonDocument("commitTransaction", "true");
                    await database.RunCommandAsync<BsonDocument>(commitTransaction);
                }
                catch (Exception)
                {
                    var retryTransaction = new BsonDocument(new[] { 
                        new BsonElement("beginTransaction", "true"),
                        new BsonElement("retry","true")
                    });

                    database.RunCommandAsync<BsonDocument>(retryTransaction).Wait();
                }
            }
        }
    }