RepositoryModel implemented

H_PLUS_Sports/Contracts/ICustomerRepository.cs

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+using H_Plus_Sports.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace H_Plus_Sports.Contracts
+{
+    public interface ICustomerRepository
+    {
+        Task<Customer> Add(Customer customer);
+        IEnumerable<Customer> GetAll();
+        Task<Customer> Find(int id);
+        Task<Customer> Update(Customer customer);
+        Task<Customer> Remove(int id);
+        Task<bool> Exist(int id);
+
+    }
+}

H_PLUS_Sports/Contracts/IOrderItemRepository.cs

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+using H_Plus_Sports.Models;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace H_Plus_Sports.Contracts
+{
+    public interface IOrderItemRepository
+    {
+        Task<OrderItem> Add(OrderItem item);
+
+        IEnumerable<OrderItem> GetAll();
+
+        Task<OrderItem> Find(int id);
+
+        Task<OrderItem> Remove(int id);
+
+        Task<OrderItem> Update(OrderItem item);
+
+        Task<bool> Exists(int id);
+    }
+}

H_PLUS_Sports/Contracts/IOrderRepository.cs

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+using H_Plus_Sports.Models;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace H_Plus_Sports.Contracts
+{
+    public interface IOrderRepository
+    {
+        Task<Order> Add(Order item);
+
+        IEnumerable<Order> GetAll();
+
+        Task<Order> Find(int id);
+
+        Task<Order> Remove(int id);
+
+        Task<Order> Update(Order item);
+
+        Task<bool> Exists(int id);
+    }
+}

H_PLUS_Sports/Contracts/IProductRepository.cs

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+using H_Plus_Sports.Models;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace H_Plus_Sports.Contracts
+{
+    public interface IProductRepository
+    {
+        Task<Product> Add(Product item);
+
+        IEnumerable<Product> GetAll();
+
+        Task<Product> Find(string id);
+
+        Task<Product> Remove(string id);
+
+        Task<Product> Update(Product item);
+
+        Task<bool> Exists(string id);
+    }
+}

H_PLUS_Sports/Contracts/ISalespersonRepository.cs

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+using H_Plus_Sports.Models;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace H_Plus_Sports.Contracts
+{
+    public interface ISalespersonRepository
+    {
+        Task<Salesperson> Add(Salesperson item);
+
+        IEnumerable<Salesperson> GetAll();
+
+        Task<Salesperson> Find(int id);
+
+        Task<Salesperson> Remove(int id);
+
+        Task<Salesperson> Update(Salesperson item);
+
+        Task<bool> Exists(int id);
+    }
+}