public static DTO.Feature2.Customer CreateUserFeature2()
        {
            var customer = new DTO.Feature2.Customer();

            customer.Id            = ObjectId.GenerateNewId();
            customer.SchemaVersion = 2;
            customer.FirstName     = "Vorname";
            customer.LastName      = "Nachname";

            return(customer);
        }
        public void InsertCustomerFeature2(DTO.Feature2.Customer user)
        {
            var coll = db.GetCollection <DTO.Feature2.Customer>(DTO.Feature2.Customer.CollectionName);

            coll.InsertOne(user);
        }