вроде все классы готовы, теперь нужно доработать формы и приступить к документам...

UserComponentsOption19/ShopDataBaseImplements/Implements/OrderStatusStorage.cs

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+using ShopContracts.BindingModels;
+using ShopContracts.SearchModels;
+using ShopContracts.StorageContracts;
+using ShopContracts.ViewModels;
+using ShopDataBaseImplements.Models;
+
+namespace ShopDataBaseImplements.Implements
+{
+    public class OrderStatusStorage : IOrderStatusStorage
+    {
+        public OrderStatusViewModel? Delete(OrderStatusBindingModel model)
+        {
+            using var context = new DataBase();
+            var element = context.OrderStatuses.FirstOrDefault(x => x.Id == model.Id);
+            if (element == null)
+            {
+                return null;
+            }
+            context.OrderStatuses.Remove(element);
+            context.SaveChanges();
+            return element.GetViewModel;
+        }
+
+        public OrderStatusViewModel? GetElement(OrderStatusSearchModel model)
+        {
+            using var context = new DataBase();
+            if(model.Id == null)
+            {
+                return null;
+            }
+            return context.OrderStatuses.FirstOrDefault(x => x.Id != model.Id)?.GetViewModel;
+        }
+
+        public List<OrderStatusViewModel> GetFilteredList(OrderStatusSearchModel model)
+        {
+            var list = GetFullList();
+            if(list == null)
+            {
+                return null;
+            }
+            if (model.Id.HasValue)
+            {
+                list = list.Where(x => x.Id == model.Id).ToList();
+            }
+            return list;
+        }
+
+        public List<OrderStatusViewModel> GetFullList()
+        {
+            using var context = new DataBase();
+            return context.OrderStatuses.Select(x => x.GetViewModel).ToList();
+        }
+
+        public OrderStatusViewModel? Insert(OrderStatusBindingModel model)
+        {
+            using var context = new DataBase();
+            var element = OrderStatus.Create(model);
+            if(element == null)
+            {
+                return null;
+            }
+            context.OrderStatuses.Add(element);
+            context.SaveChanges();
+            return element.GetViewModel;
+        }
+
+        public OrderStatusViewModel? Update(OrderStatusBindingModel model)
+        {
+            using var context = new DataBase();
+            using var transaction = context.Database.BeginTransaction();
+            try
+            {
+                var element = context.OrderStatuses.FirstOrDefault(x => x.Id == model.Id);
+                if (element == null)
+                {
+                    return null;
+                }
+                element.Update(model);
+                context.SaveChanges();
+                transaction.Commit();
+                return element.GetViewModel;
+            }
+            catch (Exception)
+            {
+                transaction.Rollback();
+                throw;
+            }
+        }
+    }
+}

UserComponentsOption19/ShopDataBaseImplements/Implements/OrderStorage.cs

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+using ShopContracts.BindingModels;
+using ShopContracts.SearchModels;
+using ShopContracts.StorageContracts;
+using ShopContracts.ViewModels;
+using ShopDataBaseImplements.Models;
+
+namespace ShopDataBaseImplements.Implements
+{
+    public class OrderStorage : IOrderStorage
+    {
+        public OrderViewModel? Delete(OrderBindingModel model)
+        {
+            using var context = new DataBase();
+            var element = context.Orders.FirstOrDefault(x => x.Id == model.Id);
+            if(element == null)
+            {
+                return null;
+            }
+            context.Orders.Remove(element);
+            context.SaveChanges();
+            return element.GetViewModel;
+        }
+
+        public OrderViewModel? GetElement(OrderSearchModel model)
+        {
+            using var context = new DataBase();
+            if(!model.Id.HasValue)
+            {
+                return null;
+            }
+            return context.Orders.FirstOrDefault(x => x.Id == model.Id)?.GetViewModel;
+        }
+
+        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
+        {
+            var list = GetFullList();
+            if (model.Id.HasValue)
+            {
+                list = list.Where(x => x.Id == model.Id).ToList();
+            }
+            return list;
+        }
+
+        public List<OrderViewModel> GetFullList()
+        {
+            using var context = new DataBase();
+            return context.Orders.Select(x => x.GetViewModel).ToList();
+        }
+
+        public OrderViewModel? Insert(OrderBindingModel model)
+        {
+            using var context = new DataBase();
+            var element = Order.Create(model);
+            if(element == null)
+            {
+                return null;
+            }
+            context.Orders.Add(element);
+            context.SaveChanges();
+            return element.GetViewModel;
+        }
+
+        public OrderViewModel? Update(OrderBindingModel model)
+        {
+            using var context = new DataBase();
+            using var transaction = context.Database.BeginTransaction();
+            try
+            {
+                var element = context.Orders.FirstOrDefault(x => x.Id == model.Id);
+                if(element == null)
+                {
+                    return null;
+                }
+                element.Update(model);
+                context.SaveChanges();
+                transaction.Commit();
+                return element.GetViewModel;
+            }
+            catch (Exception)
+            {
+                transaction.Rollback();
+                throw;
+            }
+        }
+    }
+}