I

Course/Contracts/Contracts.csproj

@@ -6,4 +6,12 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <Folder Include="BindingModels\" />
+    <Folder Include="BusinessLogicsContracts\" />
+    <Folder Include="SearchModels\" />
+    <Folder Include="StoragesContracts\" />
+    <Folder Include="ViewModels\" />
+  </ItemGroup>
+
 </Project>

Course/DataModels/IId.cs

@@ -3,5 +3,6 @@
     public interface IId
     {
         int Id { get; }
+        int UserId { get; }
     }
 }

Course/DataModels/Models/IDetailModel.cs

@@ -1,6 +1,8 @@
 namespace DataModels.Models
 {
-    public interface IDetailModel
+    public interface IDetailModel : IId
     {
+        string Name { get; }
+        double Cost { get; }
     }
 }

Course/DataModels/Models/IProductModel.cs

@@ -0,0 +1,8 @@
+namespace DataModels.Models
+{
+    public interface IProductModel : IId
+    {
+        string Name { get; }
+        double Cost { get; }
+    }
+}

Course/DataModels/Models/IProductionModel.cs

@@ -0,0 +1,8 @@
+namespace DataModels.Models
+{
+    public interface IProductionModel : IId
+    {
+        string Name { get; }
+        double Cost { get; }
+    }
+}

Course/DataModels/Models/IUserModel.cs

@@ -0,0 +1,12 @@
+namespace DataModels.Models
+{
+    public interface IUserModel
+    {
+        int Id { get; }
+        string Email { get; }
+        string Name { get; }
+        string Login { get; }
+        string Password { get; }
+
+    }
+}