diff --git a/Pizzeria/PizzeriaContracts/BindingModels/OrderBindingModel.cs b/Pizzeria/PizzeriaContracts/BindingModels/OrderBindingModel.cs
index 6f0cb64..88d6a4a 100644
--- a/Pizzeria/PizzeriaContracts/BindingModels/OrderBindingModel.cs
+++ b/Pizzeria/PizzeriaContracts/BindingModels/OrderBindingModel.cs
@@ -1,4 +1,5 @@
-using PizzeriaDataModels.Enums;
+using System;
+using PizzeriaDataModels.Enums;
 using PizzeriaDataModels.Models;
 
 namespace PizzeriaContracts.BindingModels
diff --git a/Pizzeria/PizzeriaContracts/BusinessLogicsContracts/IClientLogic.cs b/Pizzeria/PizzeriaContracts/BusinessLogicsContracts/IClientLogic.cs
index 46f8676..03ce57e 100644
--- a/Pizzeria/PizzeriaContracts/BusinessLogicsContracts/IClientLogic.cs
+++ b/Pizzeria/PizzeriaContracts/BusinessLogicsContracts/IClientLogic.cs
@@ -1,6 +1,7 @@
 using PizzeriaContracts.BindingModels;
 using PizzeriaContracts.ViewModels;
 using PizzeriaContracts.SearchModels;
+using System.Collections.Generic;
 
 namespace PizzeriaContracts.BusinessLogicsContracts
 {
diff --git a/Pizzeria/PizzeriaContracts/BusinessLogicsContracts/IPizzaLogic.cs b/Pizzeria/PizzeriaContracts/BusinessLogicsContracts/IPizzaLogic.cs
index 5ab632a..d1f276e 100644
--- a/Pizzeria/PizzeriaContracts/BusinessLogicsContracts/IPizzaLogic.cs
+++ b/Pizzeria/PizzeriaContracts/BusinessLogicsContracts/IPizzaLogic.cs
@@ -1,4 +1,5 @@
-using PizzeriaContracts.BindingModels;
+using System.Collections.Generic;
+using PizzeriaContracts.BindingModels;
 using PizzeriaContracts.SearchModels;
 using PizzeriaContracts.ViewModels;
 
diff --git a/Pizzeria/PizzeriaContracts/StorageContracts/IClientStorage.cs b/Pizzeria/PizzeriaContracts/StorageContracts/IClientStorage.cs
index d406342..686e554 100644
--- a/Pizzeria/PizzeriaContracts/StorageContracts/IClientStorage.cs
+++ b/Pizzeria/PizzeriaContracts/StorageContracts/IClientStorage.cs
@@ -1,4 +1,5 @@
-using PizzeriaContracts.BindingModels;
+using System.Collections.Generic;
+using PizzeriaContracts.BindingModels;
 using PizzeriaContracts.SearchModels;
 using PizzeriaContracts.ViewModels;
 
diff --git a/Pizzeria/PizzeriaContracts/StorageContracts/IOrderStorage.cs b/Pizzeria/PizzeriaContracts/StorageContracts/IOrderStorage.cs
index e60b5dd..a618338 100644
--- a/Pizzeria/PizzeriaContracts/StorageContracts/IOrderStorage.cs
+++ b/Pizzeria/PizzeriaContracts/StorageContracts/IOrderStorage.cs
@@ -1,4 +1,5 @@
-using PizzeriaContracts.BindingModels;
+using System.Collections.Generic;
+using PizzeriaContracts.BindingModels;
 using PizzeriaContracts.SearchModels;
 using PizzeriaContracts.ViewModels;
 
diff --git a/Pizzeria/PizzeriaContracts/StorageContracts/IPizzaStorage.cs b/Pizzeria/PizzeriaContracts/StorageContracts/IPizzaStorage.cs
index 4ec1629..cf3f426 100644
--- a/Pizzeria/PizzeriaContracts/StorageContracts/IPizzaStorage.cs
+++ b/Pizzeria/PizzeriaContracts/StorageContracts/IPizzaStorage.cs
@@ -1,4 +1,5 @@
-using PizzeriaContracts.BindingModels;
+using System.Collections.Generic;
+using PizzeriaContracts.BindingModels;
 using PizzeriaContracts.SearchModels;
 using PizzeriaContracts.ViewModels;
 
diff --git a/Pizzeria/PizzeriaContracts/ViewModels/OrderViewModel.cs b/Pizzeria/PizzeriaContracts/ViewModels/OrderViewModel.cs
index 64d9592..cb411df 100644
--- a/Pizzeria/PizzeriaContracts/ViewModels/OrderViewModel.cs
+++ b/Pizzeria/PizzeriaContracts/ViewModels/OrderViewModel.cs
@@ -1,5 +1,6 @@
 using PizzeriaDataModels.Enums;
 using PizzeriaDataModels.Models;
+using System;
 using System.ComponentModel;
 
 namespace PizzeriaContracts.ViewModels
diff --git a/Pizzeria/PizzeriaDataModels/Models/IOrderModel.cs b/Pizzeria/PizzeriaDataModels/Models/IOrderModel.cs
index 3742d1e..83add86 100644
--- a/Pizzeria/PizzeriaDataModels/Models/IOrderModel.cs
+++ b/Pizzeria/PizzeriaDataModels/Models/IOrderModel.cs
@@ -1,4 +1,5 @@
-using PizzeriaDataModels.Enums;
+using System;
+using PizzeriaDataModels.Enums;
 
 namespace PizzeriaDataModels.Models
 {