секрте

PlumbingRepair/PlumbingRepairContracts/BindingModels/ShopBindingModel.cs

@@ -8,7 +8,7 @@ using System.Threading.Tasks;
 
 namespace PlumbingRepairContracts.BindingModels
 {
-    public class ShopBindingModel
+    public class ShopBindingModel : IShopModel
 	{
         public int Id { get; set; }
 

PlumbingRepair/PlumbingRepairContracts/ViewModels/ShopViewModel.cs

@@ -4,7 +4,7 @@ using System.ComponentModel;
 
 namespace PlumbingRepairContracts.ViewModels
 {
-    public class ShopViewModel
+    public class ShopViewModel : IShopModel
 	{
 		[Column(visible: false)]
 		public int Id { get; set; }

PlumbingRepair/PlumbingRepairDataModels/Models/IShopModel.cs

@@ -1,6 +1,6 @@
 namespace PlumbingRepairDataModels.Models
 {
-    public class IShopModel
+    public interface IShopModel: IId
     {
         string ShopName { get; }
 

PlumbingRepair/PlumbingRepairDatabaseImplement/Models/Shop.cs

@@ -9,7 +9,7 @@ using System.Runtime.Serialization;
 namespace PlumbingRepairDatabaseImplement.Models
 {
 	[DataContract]
-	public class Shop
+	public class Shop : IShopModel
 	{
 		[DataMember]
 		public int Id { get; set; }