Не работает

ComputerStoreProject/ComputerStoreContracts/BusinessLogicContracts/IRequestBusinessLogicContract.cs

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+using ComputerStoreContracts.BindingModels;
+using ComputerStoreContracts.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ComputerStoreContracts.BusinessLogicContracts;
+
+public interface IRequestBusinessLogicContract
+{
+    List<RequestViewModel>? ReadList(RequestBindingModel? model);
+    RequestViewModel? ReadElement(RequestBindingModel model);
+    void Create(RequestBindingModel model);
+    void Update(RequestBindingModel model);
+    void Delete(RequestBindingModel model);
+}