using MongoDB.Driver; namespace BarberShopMongoDBImplement { public class BarberShopMongoDatabase { public static BarberShopMongoDatabase? instance; public MongoClient client; private BarberShopMongoDatabase() { client = new MongoClient("mongodb://localhost:27017"); } public static BarberShopMongoDatabase getInstance() { if (instance == null) { instance = new BarberShopMongoDatabase(); } return instance; } } }