private void AddToDb(Package package, SavePackageModel model)
        {
            Kernel.DB.PackageRepository.Add(package);

            foreach (var serviceModel in model.Services)
            {
                if (serviceModel.IsSelected)
                {
                    var service = new Service
                    {
                        Id   = serviceModel.Id,
                        Name = serviceModel.Name
                    };

                    var packageService = new PackageService
                    {
                        Package = package,
                        Service = service
                    };

                    Kernel.DB.PackageServiceRepository.Add(packageService);
                }
            }
        }
        private void Update(Package package, SavePackageModel model)
        {
            var currentPackage = Kernel.DB.PackageRepository.Get(package.Id);

            #region Example 1
            // Eger servisin Id-si current lerin icinde varsa
            // Eger servisin id-si currentlerde var indi yoxdusa silirem
            // Eger servisin id-si currentlerde yoxdu indi varsa elave edirem

            //foreach (var serviceModel in model.Services)
            //{
            //    bool isNewService = true;

            //    foreach(var srv in currentPackage.Services)
            //    {
            //        if(srv.Id == serviceModel.Id)
            //        {
            //            if(!serviceModel.IsSelected)
            //            {
            //                Kernel.DB.PackageServiceRepository.Delete(new PackageService
            //                {
            //                    Package = package,
            //                    Service = new Service { Id = srv.Id }
            //                });
            //            }

            //            isNewService = serviceModel.IsSelected;
            //        }
            //    }

            //    if(isNewService)
            //    {
            //        Kernel.DB.PackageServiceRepository.Add(new PackageService
            //        {
            //            Package = package,
            //            Service = new Service { Id = serviceModel.Id }
            //        });
            //    }
            //}

            #endregion

            foreach (var srv in currentPackage.Services)
            {
                Kernel.DB.PackageServiceRepository.Delete(new PackageService {
                    Package = package, Service = srv
                });
            }

            foreach (var serviceModel in model.Services)
            {
                if (serviceModel.IsSelected)
                {
                    Kernel.DB.PackageServiceRepository.Add(new PackageService {
                        Package = package, Service = new Service {
                            Id = serviceModel.Id
                        }
                    });
                }
            }

            Kernel.DB.PackageRepository.Update(package);
        }