ProjectCompanyFurniture/ProjectCompanyFurniture/Entities/Client.cs

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+using ProjectCompanyFurniture.Entities.Enums;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ProjectCompanyFurniture.Entities;
+
+public class Client
+{
+    public int ID { get; private set; }
+
+    public string Name { get; private set; }
+
+    public ClientType ClientType { get; private set; }
+
+    public bool Optovik { get; private set; }
+
+    public static Client CreateClient(int id, string name, ClientType clientType, bool optovik)
+    {
+        return new Client
+        {
+            ID = id,
+            Name = name,
+            ClientType = clientType,
+            Optovik = optovik
+        };
+    }
+}

ProjectCompanyFurniture/ProjectCompanyFurniture/Entities/Enums/ClientType.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ProjectCompanyFurniture.Entities.Enums;
+
+[Flags]
+public enum ClientType
+{
+    None = 0,
+    /// <summary>
+    /// частное лицо
+    /// </summary>
+    PrivatePerson = 1,
+    /// <summary>
+    /// предприниматель
+    /// </summary>
+    Entrepreneur = 2,
+    /// <summary>
+    /// организация
+    /// </summary>
+    Organization = 4
+
+}

ProjectCompanyFurniture/ProjectCompanyFurniture/Entities/Enums/Movement.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ProjectCompanyFurniture.Entities.Enums;
+
+public enum Movement
+{
+    None = 0,
+    /// <summary>
+    /// проступление
+    /// </summary>
+    Reseipt = 1,
+    /// <summary>
+    /// продажа
+    /// </summary>
+    Sale = 2,
+    /// <summary>
+    /// перемещение на склад
+    /// </summary>
+    MovingToWarehouse = 3,
+
+    /// <summary>
+    /// подготовка к отправке
+    /// </summary>
+    PreparationForShipment = 4,
+    /// <summary>
+    /// перемещение в магазин
+    /// </summary>
+    MovingToStore = 5,
+        
+}

ProjectCompanyFurniture/ProjectCompanyFurniture/Entities/Invoice.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ProjectCompanyFurniture.Entities;
+
+public class Invoice
+{
+    public int ID { get; private set; }
+
+    public int ClientID { get; set; }
+
+    public int AvailabilityOfPromotionalCode { get; set; }
+
+    public int DiscountPercentage { get; set; }
+
+    public int SellingPrice { get; set; }
+
+    DateTime Data { get; set; }
+
+    public static Invoice CreateInvoice(int id, int clientId, int availabilityOfPromotionalCode, int discountPercentage,
+        int sellingPrice, DateTime data)
+    {
+        return new Invoice
+        {
+            ID = id,
+            ClientID = clientId,
+            AvailabilityOfPromotionalCode = availabilityOfPromotionalCode,
+            DiscountPercentage = discountPercentage,
+            SellingPrice = sellingPrice,
+            Data = data
+        };
+    }
+}

ProjectCompanyFurniture/ProjectCompanyFurniture/Entities/InvoiceProduct.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ProjectCompanyFurniture;
+
+public class InvoiceProduct
+{
+    public int InvoiceID { get; private set; }
+
+    public int ProductID { get; private set; }
+
+    public int Count { get; private set; }
+
+    public static InvoiceProduct CreateInvoiceProduct(int invoiceId, int productID, int count)
+    {
+        return new InvoiceProduct
+        {
+            InvoiceID = invoiceId,
+            ProductID = productID,
+            Count = count
+        };
+    }
+}

ProjectCompanyFurniture/ProjectCompanyFurniture/Entities/Manufacturer.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ProjectCompanyFurniture.Entities;
+
+public  class Manufacturer
+{
+    public int ID { get; set; }
+
+    public string Name { get; set; }
+
+    public static Manufacturer CreateManufacturer(int iD, string name)
+    {
+        return new Manufacturer
+        {
+            ID = iD,
+            Name = name
+        };
+    }
+}

ProjectCompanyFurniture/ProjectCompanyFurniture/Entities/ProductMovement.cs

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+using ProjectCompanyFurniture.Entities.Enums;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ProjectCompanyFurniture.Entities;
+
+public class ProductMovement
+{
+    public int ID { get; private set; }
+
+    public int ProductID { get; private set; }
+
+    public Movement MovementProduct { get; private set; }
+
+    public ProductMovement CreateProductMovement (int it, int productId, Movement movement)
+    {
+        return new ProductMovement
+        {
+            ID = it,
+            ProductID = productId,
+            MovementProduct = movement
+        };
+    }
+}