diff --git a/NorthwindCRUD.Tests/CategroyServiceFixture.cs b/NorthwindCRUD.Tests/CategroyServiceFixture.cs
index 95de263..ceeacd3 100644
--- a/NorthwindCRUD.Tests/CategroyServiceFixture.cs
+++ b/NorthwindCRUD.Tests/CategroyServiceFixture.cs
@@ -28,7 +28,7 @@ public void ShouldUpdateCategory()
 
             createdCategory.Name = "Updated Category";
             createdCategory.Description = "Updated Description";
-            var updatedCategory = DataHelper.CategoryService.Update(createdCategory);
+            var updatedCategory = DataHelper.CategoryService.Update(createdCategory.CategoryId, createdCategory);
 
             Assert.IsNotNull(updatedCategory);
             updatedCategory = DataHelper2.CategoryService.GetById(updatedCategory.CategoryId);
diff --git a/NorthwindCRUD.Tests/EmployeeServiceFixture.cs b/NorthwindCRUD.Tests/EmployeeServiceFixture.cs
index 832881f..40cb8d0 100644
--- a/NorthwindCRUD.Tests/EmployeeServiceFixture.cs
+++ b/NorthwindCRUD.Tests/EmployeeServiceFixture.cs
@@ -29,7 +29,7 @@ public void ShouldUpdateEmployee()
             var createdEmployee = DataHelper.EmployeeService.Create(employee);
 
             createdEmployee.Title = "Director";
-            var updatedEmployee = DataHelper.EmployeeService.Update(createdEmployee);
+            var updatedEmployee = DataHelper.EmployeeService.Update(createdEmployee.EmployeeId, createdEmployee);
 
             Assert.IsNotNull(updatedEmployee);
             updatedEmployee = DataHelper2.EmployeeService.GetById(updatedEmployee.EmployeeId);
diff --git a/NorthwindCRUD.Tests/OrderServiceFixture.cs b/NorthwindCRUD.Tests/OrderServiceFixture.cs
index 67aebc7..a66e7a6 100644
--- a/NorthwindCRUD.Tests/OrderServiceFixture.cs
+++ b/NorthwindCRUD.Tests/OrderServiceFixture.cs
@@ -37,7 +37,7 @@ public void ShouldUpdateOrder()
             order.CustomerId = DataHelper.CreateCustomer().CustomerId;
             order.EmployeeId = DataHelper.CreateEmployee().EmployeeId;
 
-            var updatedOrder = DataHelper.OrderService.Update(order);
+            var updatedOrder = DataHelper.OrderService.Update(order.OrderId, order);
 
             Assert.IsNotNull(updatedOrder);
             updatedOrder = DataHelper2.OrderService.GetById(updatedOrder.OrderId);
diff --git a/NorthwindCRUD.Tests/ProductServiceFixture.cs b/NorthwindCRUD.Tests/ProductServiceFixture.cs
index d3be0ba..3293d75 100644
--- a/NorthwindCRUD.Tests/ProductServiceFixture.cs
+++ b/NorthwindCRUD.Tests/ProductServiceFixture.cs
@@ -27,7 +27,7 @@ public void ShouldUpdateProduct()
             createdProduct.UnitPrice = 15;
             createdProduct.UnitsInStock = 50;
 
-            var updatedProduct = DataHelper.ProductService.Update(createdProduct);
+            var updatedProduct = DataHelper.ProductService.Update(createdProduct.ProductId, createdProduct);
 
             Assert.IsNotNull(updatedProduct);
             updatedProduct = DataHelper2.ProductService.GetById(updatedProduct.ProductId);
diff --git a/NorthwindCRUD.Tests/RegionServiceFixture.cs b/NorthwindCRUD.Tests/RegionServiceFixture.cs
index f263088..4b53c1f 100644
--- a/NorthwindCRUD.Tests/RegionServiceFixture.cs
+++ b/NorthwindCRUD.Tests/RegionServiceFixture.cs
@@ -27,7 +27,7 @@ public void ShouldUpdateRegion()
             string originalRegionDescription = region.RegionDescription;
             region.RegionDescription = "Updated Region";
 
-            var updatedRegion = DataHelper.RegionService.Update(region);
+            var updatedRegion = DataHelper.RegionService.Update(region.RegionId, region);
 
             Assert.IsNotNull(updatedRegion);
             updatedRegion = DataHelper2.RegionService.GetById(updatedRegion.RegionId);
diff --git a/NorthwindCRUD.Tests/ShipperServiceFixture.cs b/NorthwindCRUD.Tests/ShipperServiceFixture.cs
index eb6713a..4b88243 100644
--- a/NorthwindCRUD.Tests/ShipperServiceFixture.cs
+++ b/NorthwindCRUD.Tests/ShipperServiceFixture.cs
@@ -31,7 +31,7 @@ public void ShouldUpdateShipper()
             shipper.CompanyName = "Updated shipper company";
             shipper.Phone = "555-555-5555";
 
-            var updatedShipper = DataHelper.ShipperService.Update(shipper);
+            var updatedShipper = DataHelper.ShipperService.Update(shipper.ShipperId, shipper);
 
             Assert.IsNotNull(updatedShipper);
             updatedShipper = DataHelper2.ShipperService.GetById(updatedShipper.ShipperId);
diff --git a/NorthwindCRUD.Tests/SupplierServiceFixture.cs b/NorthwindCRUD.Tests/SupplierServiceFixture.cs
index 60357af..823dafc 100644
--- a/NorthwindCRUD.Tests/SupplierServiceFixture.cs
+++ b/NorthwindCRUD.Tests/SupplierServiceFixture.cs
@@ -34,7 +34,7 @@ public void ShouldUpdateSupplier()
             supplier.ContactName = "Updated Contact";
             supplier.ContactTitle = "Updated Title";
 
-            var updatedSupplier = DataHelper.SupplierService.Update(supplier);
+            var updatedSupplier = DataHelper.SupplierService.Update(supplier.SupplierId, supplier);
             Assert.IsNotNull(updatedSupplier);
             updatedSupplier = DataHelper2.SupplierService.GetById(updatedSupplier.SupplierId);
             Assert.IsNotNull(updatedSupplier);
diff --git a/NorthwindCRUD.Tests/TerritoryServiceFixture.cs b/NorthwindCRUD.Tests/TerritoryServiceFixture.cs
index 4747dc3..b636f6d 100644
--- a/NorthwindCRUD.Tests/TerritoryServiceFixture.cs
+++ b/NorthwindCRUD.Tests/TerritoryServiceFixture.cs
@@ -29,7 +29,7 @@ public void ShouldUpdateTerritory()
 
             createdTerritory.TerritoryDescription = "Updated Territory";
 
-            var updatedTerritory = DataHelper.TerritoryService.Update(createdTerritory);
+            var updatedTerritory = DataHelper.TerritoryService.Update(createdTerritory.TerritoryId, createdTerritory);
 
             Assert.IsNotNull(updatedTerritory);
             updatedTerritory = DataHelper2.TerritoryService.GetById(updatedTerritory.TerritoryId);
diff --git a/NorthwindCRUD/Controllers/CategoriesController.cs b/NorthwindCRUD/Controllers/CategoriesController.cs
index bf61678..eb7d20d 100644
--- a/NorthwindCRUD/Controllers/CategoriesController.cs
+++ b/NorthwindCRUD/Controllers/CategoriesController.cs
@@ -198,16 +198,16 @@ public ActionResult<CategoryDetailsDto> Create(CategoryDto model)
             }
         }
 
-        [HttpPut]
+        [HttpPut("{id}")]
         [Authorize]
-        public ActionResult<CategoryDto> Update(CategoryDto model)
+        public ActionResult<CategoryDto> Update(int id, CategoryDto model)
         {
             try
             {
                 if (ModelState.IsValid)
                 {
                     var mappedModel = this.mapper.Map<CategoryDto, CategoryDb>(model);
-                    var category = this.categoryService.Update(mappedModel);
+                    var category = this.categoryService.Update(id, mappedModel);
 
                     if (category != null)
                     {
diff --git a/NorthwindCRUD/Controllers/CustomersController.cs b/NorthwindCRUD/Controllers/CustomersController.cs
index 756149b..98f6abd 100644
--- a/NorthwindCRUD/Controllers/CustomersController.cs
+++ b/NorthwindCRUD/Controllers/CustomersController.cs
@@ -209,16 +209,16 @@ public ActionResult<CustomerDto> Create(CustomerDto model)
             }
         }
 
-        [HttpPut]
+        [HttpPut("{id}")]
         [Authorize]
-        public ActionResult<CustomerDto> Update(CustomerDto model)
+        public ActionResult<CustomerDto> Update(string id, CustomerDto model)
         {
             try
             {
                 if (ModelState.IsValid)
                 {
                     var mappedModel = this.mapper.Map<CustomerDto, CustomerDb>(model);
-                    var customer = this.customerService.Update(mappedModel);
+                    var customer = this.customerService.Update(id, mappedModel);
 
                     if (customer != null)
                     {
diff --git a/NorthwindCRUD/Controllers/EmployeesController.cs b/NorthwindCRUD/Controllers/EmployeesController.cs
index a7b20bf..7974acd 100644
--- a/NorthwindCRUD/Controllers/EmployeesController.cs
+++ b/NorthwindCRUD/Controllers/EmployeesController.cs
@@ -304,16 +304,16 @@ public ActionResult<EmployeeDto> Create(EmployeeDto model)
             }
         }
 
-        [HttpPut]
+        [HttpPut("{id}")]
         [Authorize]
-        public ActionResult<EmployeeDto> Update(EmployeeDto model)
+        public ActionResult<EmployeeDto> Update(int id, EmployeeDto model)
         {
             try
             {
                 if (ModelState.IsValid)
                 {
                     var mappedModel = this.mapper.Map<EmployeeDto, EmployeeDb>(model);
-                    var employee = this.employeeService.Update(mappedModel);
+                    var employee = this.employeeService.Update(id, mappedModel);
 
                     if (employee != null)
                     {
diff --git a/NorthwindCRUD/Controllers/OrdersController.cs b/NorthwindCRUD/Controllers/OrdersController.cs
index e247d03..49b7f0f 100644
--- a/NorthwindCRUD/Controllers/OrdersController.cs
+++ b/NorthwindCRUD/Controllers/OrdersController.cs
@@ -311,16 +311,16 @@ public ActionResult<OrderDto> Create(OrderDto model)
             }
         }
 
-        [HttpPut]
+        [HttpPut("{id}")]
         [Authorize]
-        public ActionResult<OrderDto> Update(OrderDto model)
+        public ActionResult<OrderDto> Update(int id, OrderDto model)
         {
             try
             {
                 if (ModelState.IsValid)
                 {
                     var mappedModel = this.mapper.Map<OrderDto, OrderDb>(model);
-                    var order = this.orderService.Update(mappedModel);
+                    var order = this.orderService.Update(id, mappedModel);
                     if (order != null)
                     {
                         return Ok(this.mapper.Map<OrderDb, OrderDto>(order));
diff --git a/NorthwindCRUD/Controllers/ProductsController.cs b/NorthwindCRUD/Controllers/ProductsController.cs
index e66ac19..976af04 100644
--- a/NorthwindCRUD/Controllers/ProductsController.cs
+++ b/NorthwindCRUD/Controllers/ProductsController.cs
@@ -277,16 +277,16 @@ public ActionResult<ProductDto> Create(ProductDto model)
             }
         }
 
-        [HttpPut]
+        [HttpPut("{id}")]
         [Authorize]
-        public ActionResult<ProductDto> Update(ProductDto model)
+        public ActionResult<ProductDto> Update(int id, ProductDto model)
         {
             try
             {
                 if (ModelState.IsValid)
                 {
                     var mappedModel = this.mapper.Map<ProductDto, ProductDb>(model);
-                    var product = this.productService.Update(mappedModel);
+                    var product = this.productService.Update(id, mappedModel);
 
                     if (product != null)
                     {
diff --git a/NorthwindCRUD/Controllers/RegionsController.cs b/NorthwindCRUD/Controllers/RegionsController.cs
index 7fde371..72467d5 100644
--- a/NorthwindCRUD/Controllers/RegionsController.cs
+++ b/NorthwindCRUD/Controllers/RegionsController.cs
@@ -183,16 +183,16 @@ public ActionResult<RegionDto> Create(RegionDto model)
             }
         }
 
-        [HttpPut]
+        [HttpPut("{id}")]
         [Authorize]
-        public ActionResult<RegionDto> Update(RegionDto model)
+        public ActionResult<RegionDto> Update(int id, RegionDto model)
         {
             try
             {
                 if (ModelState.IsValid)
                 {
                     var mappedModel = this.mapper.Map<RegionDto, RegionDb>(model);
-                    var region = this.regionService.Update(mappedModel);
+                    var region = this.regionService.Update(id, mappedModel);
 
                     if (region != null)
                     {
diff --git a/NorthwindCRUD/Controllers/ShippersController.cs b/NorthwindCRUD/Controllers/ShippersController.cs
index 0a28356..a7c3268 100644
--- a/NorthwindCRUD/Controllers/ShippersController.cs
+++ b/NorthwindCRUD/Controllers/ShippersController.cs
@@ -178,16 +178,16 @@ public ActionResult<ShipperDto> Create(ShipperDto model)
             }
         }
 
-        [HttpPut]
+        [HttpPut("{id}")]
         [Authorize]
-        public ActionResult<ShipperDto> Update(ShipperDto model)
+        public ActionResult<ShipperDto> Update(int id, ShipperDto model)
         {
             try
             {
                 if (ModelState.IsValid)
                 {
                     var mappedModel = this.mapper.Map<ShipperDto, ShipperDb>(model);
-                    var shipper = this.shipperService.Update(mappedModel);
+                    var shipper = this.shipperService.Update(id, mappedModel);
 
                     if (shipper != null)
                     {
diff --git a/NorthwindCRUD/Controllers/SuppliersController.cs b/NorthwindCRUD/Controllers/SuppliersController.cs
index c8b65e6..280f45e 100644
--- a/NorthwindCRUD/Controllers/SuppliersController.cs
+++ b/NorthwindCRUD/Controllers/SuppliersController.cs
@@ -178,16 +178,16 @@ public ActionResult<SupplierDto> Create(SupplierDto model)
             }
         }
 
-        [HttpPut]
+        [HttpPut("{id}")]
         [Authorize]
-        public ActionResult<SupplierDto> Update(SupplierDto model)
+        public ActionResult<SupplierDto> Update(int id, SupplierDto model)
         {
             try
             {
                 if (ModelState.IsValid)
                 {
                     var mappedModel = this.mapper.Map<SupplierDto, SupplierDb>(model);
-                    var supplier = this.supplierService.Update(mappedModel);
+                    var supplier = this.supplierService.Update(id, mappedModel);
 
                     if (supplier != null)
                     {
diff --git a/NorthwindCRUD/Controllers/TerritoriesController.cs b/NorthwindCRUD/Controllers/TerritoriesController.cs
index e96ba59..1a858fe 100644
--- a/NorthwindCRUD/Controllers/TerritoriesController.cs
+++ b/NorthwindCRUD/Controllers/TerritoriesController.cs
@@ -214,16 +214,16 @@ public ActionResult<TerritoryDto> Create(TerritoryDto model)
             }
         }
 
-        [HttpPut]
+        [HttpPut("{id}")]
         [Authorize]
-        public ActionResult<TerritoryDto> Update(TerritoryDto model)
+        public ActionResult<TerritoryDto> Update(string id, TerritoryDto model)
         {
             try
             {
                 if (ModelState.IsValid)
                 {
                     var mappedModel = this.mapper.Map<TerritoryDto, TerritoryDb>(model);
-                    var territory = this.territoryService.Update(mappedModel);
+                    var territory = this.territoryService.Update(id, mappedModel);
 
                     if (territory != null)
                     {
diff --git a/NorthwindCRUD/ControllersGraphQL/CategoryController.cs b/NorthwindCRUD/ControllersGraphQL/CategoryController.cs
index c5ba167..96ff99f 100644
--- a/NorthwindCRUD/ControllersGraphQL/CategoryController.cs
+++ b/NorthwindCRUD/ControllersGraphQL/CategoryController.cs
@@ -50,10 +50,10 @@ public CategoryDto Create(CategoryDto model)
         }
 
         [Mutation]
-        public CategoryDto? Update(CategoryDto model)
+        public CategoryDto? Update(int id, CategoryDto model)
         {
             var mappedModel = this.mapper.Map<CategoryDto, CategoryDb>(model);
-            var category = this.categoryService.Update(mappedModel);
+            var category = this.categoryService.Update(id, mappedModel);
 
             return category != null ? this.mapper.Map<CategoryDb, CategoryDto>(category) : null;
         }
diff --git a/NorthwindCRUD/ControllersGraphQL/CustomerController.cs b/NorthwindCRUD/ControllersGraphQL/CustomerController.cs
index af5d0a1..6a6927b 100644
--- a/NorthwindCRUD/ControllersGraphQL/CustomerController.cs
+++ b/NorthwindCRUD/ControllersGraphQL/CustomerController.cs
@@ -51,10 +51,10 @@ public CustomerDto Create(CustomerDto model)
         }
 
         [Mutation]
-        public CustomerDto? Update(CustomerDto model)
+        public CustomerDto? Update(string id, CustomerDto model)
         {
             var mappedModel = this.mapper.Map<CustomerDto, CustomerDb>(model);
-            var customer = this.customerService.Update(mappedModel);
+            var customer = this.customerService.Update(id, mappedModel);
             return customer != null ? this.mapper.Map<CustomerDb, CustomerDto>(customer) : null;
         }
 
diff --git a/NorthwindCRUD/ControllersGraphQL/EmployeeController.cs b/NorthwindCRUD/ControllersGraphQL/EmployeeController.cs
index f9cead2..2a56db1 100644
--- a/NorthwindCRUD/ControllersGraphQL/EmployeeController.cs
+++ b/NorthwindCRUD/ControllersGraphQL/EmployeeController.cs
@@ -51,10 +51,10 @@ public EmployeeDto Create(EmployeeDto model)
         }
 
         [Mutation]
-        public EmployeeDto? Update(EmployeeDto model)
+        public EmployeeDto? Update(int id, EmployeeDto model)
         {
             var mappedModel = this.mapper.Map<EmployeeDto, EmployeeDb>(model);
-            var employee = this.employeeService.Update(mappedModel);
+            var employee = this.employeeService.Update(id, mappedModel);
             return employee != null ? this.mapper.Map<EmployeeDb, EmployeeDto>(employee) : null;
         }
 
diff --git a/NorthwindCRUD/ControllersGraphQL/OrderController.cs b/NorthwindCRUD/ControllersGraphQL/OrderController.cs
index 06eda20..5d22114 100644
--- a/NorthwindCRUD/ControllersGraphQL/OrderController.cs
+++ b/NorthwindCRUD/ControllersGraphQL/OrderController.cs
@@ -50,10 +50,10 @@ public OrderDto Create(OrderDto model)
         }
 
         [Mutation]
-        public OrderDto? Update(OrderDto model)
+        public OrderDto? Update(int id, OrderDto model)
         {
             var mappedModel = this.mapper.Map<OrderDto, OrderDb>(model);
-            var order = this.orderService.Update(mappedModel);
+            var order = this.orderService.Update(id, mappedModel);
             return order != null ? this.mapper.Map<OrderDb, OrderDto>(order) : null;
         }
 
diff --git a/NorthwindCRUD/Models/Contracts/ICategory.cs b/NorthwindCRUD/Models/Contracts/ICategory.cs
index 0826e3d..8596d43 100644
--- a/NorthwindCRUD/Models/Contracts/ICategory.cs
+++ b/NorthwindCRUD/Models/Contracts/ICategory.cs
@@ -2,7 +2,7 @@
 {
     public interface ICategory
     {
-        int CategoryId { get; set; }
+        int CategoryId { get; }
 
         string Description { get; set; }
 
diff --git a/NorthwindCRUD/Models/Contracts/ICustomer.cs b/NorthwindCRUD/Models/Contracts/ICustomer.cs
index 3f05c49..95cbf15 100644
--- a/NorthwindCRUD/Models/Contracts/ICustomer.cs
+++ b/NorthwindCRUD/Models/Contracts/ICustomer.cs
@@ -4,7 +4,7 @@ namespace NorthwindCRUD.Models.Contracts
 {
     public interface ICustomer
     {
-        string CustomerId { get; set; }
+        string CustomerId { get; }
 
         string CompanyName { get; set; }
 
diff --git a/NorthwindCRUD/Models/Contracts/IEmployee.cs b/NorthwindCRUD/Models/Contracts/IEmployee.cs
index 62f4428..1e125b1 100644
--- a/NorthwindCRUD/Models/Contracts/IEmployee.cs
+++ b/NorthwindCRUD/Models/Contracts/IEmployee.cs
@@ -4,7 +4,7 @@ namespace NorthwindCRUD.Models.Contracts
 {
     public interface IEmployee
     {
-        int EmployeeId { get; set; }
+        int EmployeeId { get; }
 
         string LastName { get; set; }
 
diff --git a/NorthwindCRUD/Models/Contracts/IOrder.cs b/NorthwindCRUD/Models/Contracts/IOrder.cs
index a427a8a..51f3d60 100644
--- a/NorthwindCRUD/Models/Contracts/IOrder.cs
+++ b/NorthwindCRUD/Models/Contracts/IOrder.cs
@@ -5,7 +5,7 @@ namespace NorthwindCRUD.Models.Contracts
 {
     public interface IOrder
     {
-        int OrderId { get; set; }
+        int OrderId { get; }
 
         string? CustomerId { get; set; }
 
diff --git a/NorthwindCRUD/Models/Contracts/IProduct.cs b/NorthwindCRUD/Models/Contracts/IProduct.cs
index 072cbc8..66bd316 100644
--- a/NorthwindCRUD/Models/Contracts/IProduct.cs
+++ b/NorthwindCRUD/Models/Contracts/IProduct.cs
@@ -2,7 +2,7 @@
 {
     public interface IProduct
     {
-        int ProductId { get; set; }
+        int ProductId { get; }
 
         int? SupplierId { get; set; }
 
diff --git a/NorthwindCRUD/Models/Contracts/IRegion.cs b/NorthwindCRUD/Models/Contracts/IRegion.cs
index 95f3b08..9cb7657 100644
--- a/NorthwindCRUD/Models/Contracts/IRegion.cs
+++ b/NorthwindCRUD/Models/Contracts/IRegion.cs
@@ -2,7 +2,7 @@
 {
     public interface IRegion
     {
-        int RegionId { get; set; }
+        int RegionId { get; }
 
         string RegionDescription { get; set; }
     }
diff --git a/NorthwindCRUD/Models/Contracts/IShipper.cs b/NorthwindCRUD/Models/Contracts/IShipper.cs
index e8321a0..027524c 100644
--- a/NorthwindCRUD/Models/Contracts/IShipper.cs
+++ b/NorthwindCRUD/Models/Contracts/IShipper.cs
@@ -2,7 +2,7 @@
 {
     public interface IShipper
     {
-         int ShipperId { get; set; }
+         int ShipperId { get; }
 
          string CompanyName { get; set; }
 
diff --git a/NorthwindCRUD/Models/Contracts/ISupplier.cs b/NorthwindCRUD/Models/Contracts/ISupplier.cs
index 264a424..5f45064 100644
--- a/NorthwindCRUD/Models/Contracts/ISupplier.cs
+++ b/NorthwindCRUD/Models/Contracts/ISupplier.cs
@@ -2,7 +2,7 @@
 {
     public interface ISupplier
     {
-        int SupplierId { get; set; }
+        int SupplierId { get; }
 
         string? CompanyName { get; set; }
 
diff --git a/NorthwindCRUD/Models/Contracts/ITerritory.cs b/NorthwindCRUD/Models/Contracts/ITerritory.cs
index 75d9269..38ac2a0 100644
--- a/NorthwindCRUD/Models/Contracts/ITerritory.cs
+++ b/NorthwindCRUD/Models/Contracts/ITerritory.cs
@@ -2,7 +2,7 @@
 {
     public interface ITerritory
     {
-        string TerritoryId { get; set; }
+        string TerritoryId { get; }
 
         string TerritoryDescription { get; set; }
 
diff --git a/NorthwindCRUD/Models/Dtos/CategoryDto.cs b/NorthwindCRUD/Models/Dtos/CategoryDto.cs
index ac04f4b..abc2d15 100644
--- a/NorthwindCRUD/Models/Dtos/CategoryDto.cs
+++ b/NorthwindCRUD/Models/Dtos/CategoryDto.cs
@@ -5,7 +5,7 @@ namespace NorthwindCRUD.Models.Dtos
 {
     public class CategoryDto : ICategory
     {
-        public int CategoryId { get; set; }
+        public int CategoryId { get; private set; }
 
         [StringLength(500, ErrorMessage = "Description cannot exceed 500 characters.")]
         public string Description { get; set; }
diff --git a/NorthwindCRUD/Models/Dtos/CustomerDto.cs b/NorthwindCRUD/Models/Dtos/CustomerDto.cs
index 47a55ae..0672f5c 100644
--- a/NorthwindCRUD/Models/Dtos/CustomerDto.cs
+++ b/NorthwindCRUD/Models/Dtos/CustomerDto.cs
@@ -5,7 +5,7 @@ namespace NorthwindCRUD.Models.Dtos
 {
     public class CustomerDto : ICustomer
     {
-        public string CustomerId { get; set; }
+        public string CustomerId { get; private set; }
 
         [Required(ErrorMessage = "Company Name is required.")]
         [StringLength(100, ErrorMessage = "Company Name cannot exceed 100 characters.")]
diff --git a/NorthwindCRUD/Models/Dtos/EmployeeDto.cs b/NorthwindCRUD/Models/Dtos/EmployeeDto.cs
index 31c70c4..1a14c59 100644
--- a/NorthwindCRUD/Models/Dtos/EmployeeDto.cs
+++ b/NorthwindCRUD/Models/Dtos/EmployeeDto.cs
@@ -7,7 +7,7 @@ namespace NorthwindCRUD.Models.Dtos
     public class EmployeeDto : IEmployee
     {
         [SwaggerSchema("Number automatically assigned to new employee.")]
-        public int EmployeeId { get; set; }
+        public int EmployeeId { get; private set; }
 
         [Required(ErrorMessage = "Last name is required.")]
         [StringLength(50, ErrorMessage = "Last name cannot exceed 50 characters.")]
diff --git a/NorthwindCRUD/Models/Dtos/OrderDto.cs b/NorthwindCRUD/Models/Dtos/OrderDto.cs
index da6c9d8..dc0cc7a 100644
--- a/NorthwindCRUD/Models/Dtos/OrderDto.cs
+++ b/NorthwindCRUD/Models/Dtos/OrderDto.cs
@@ -6,7 +6,7 @@ namespace NorthwindCRUD.Models.Dtos
 {
     public class OrderDto : IOrder
     {
-        public int OrderId { get; set; }
+        public int OrderId { get; private set; }
 
         [Required(ErrorMessage = "CustomerId is required.")]
         public string? CustomerId { get; set; }
diff --git a/NorthwindCRUD/Models/Dtos/ProductDto.cs b/NorthwindCRUD/Models/Dtos/ProductDto.cs
index 83f5bf4..cdb3232 100644
--- a/NorthwindCRUD/Models/Dtos/ProductDto.cs
+++ b/NorthwindCRUD/Models/Dtos/ProductDto.cs
@@ -5,7 +5,7 @@ namespace NorthwindCRUD.Models.Dtos
 {
     public class ProductDto : IProduct
     {
-        public int ProductId { get; set; }
+        public int ProductId { get; private set; }
 
         public string ProductName { get; set; }
 
diff --git a/NorthwindCRUD/Models/Dtos/RegionDto.cs b/NorthwindCRUD/Models/Dtos/RegionDto.cs
index 6cec254..c267449 100644
--- a/NorthwindCRUD/Models/Dtos/RegionDto.cs
+++ b/NorthwindCRUD/Models/Dtos/RegionDto.cs
@@ -4,7 +4,7 @@ namespace NorthwindCRUD.Models.Dtos
 {
     public class RegionDto : IRegion
     {
-        public int RegionId { get; set; }
+        public int RegionId { get; private set; }
 
         public string RegionDescription { get; set; }
     }
diff --git a/NorthwindCRUD/Models/Dtos/ShipperDto.cs b/NorthwindCRUD/Models/Dtos/ShipperDto.cs
index 283b215..a282557 100644
--- a/NorthwindCRUD/Models/Dtos/ShipperDto.cs
+++ b/NorthwindCRUD/Models/Dtos/ShipperDto.cs
@@ -5,7 +5,7 @@ namespace NorthwindCRUD.Models.Dtos
 {
     public class ShipperDto : IShipper
     {
-        public int ShipperId { get; set; }
+        public int ShipperId { get; private set; }
 
         [Required(ErrorMessage = "Company Name is required.")]
         [StringLength(100, ErrorMessage = "Company Name cannot exceed 100 characters.")]
diff --git a/NorthwindCRUD/Models/Dtos/SupplierDto.cs b/NorthwindCRUD/Models/Dtos/SupplierDto.cs
index 6916760..1d8a57a 100644
--- a/NorthwindCRUD/Models/Dtos/SupplierDto.cs
+++ b/NorthwindCRUD/Models/Dtos/SupplierDto.cs
@@ -5,7 +5,7 @@ namespace NorthwindCRUD.Models.Dtos
 {
     public class SupplierDto : ISupplier
     {
-        public int SupplierId { get; set; }
+        public int SupplierId { get; private set; }
 
         [Required(ErrorMessage = "Company Name is required.")]
         [StringLength(100, ErrorMessage = "Company Name cannot exceed 100 characters.")]
diff --git a/NorthwindCRUD/Models/Dtos/TerritoryDto.cs b/NorthwindCRUD/Models/Dtos/TerritoryDto.cs
index 75570e2..55847a5 100644
--- a/NorthwindCRUD/Models/Dtos/TerritoryDto.cs
+++ b/NorthwindCRUD/Models/Dtos/TerritoryDto.cs
@@ -4,7 +4,7 @@ namespace NorthwindCRUD.Models.Dtos
 {
     public class TerritoryDto : ITerritory
     {
-        public string TerritoryId { get; set; }
+        public string TerritoryId { get; private set; }
 
         public string TerritoryDescription { get; set; }
 
diff --git a/NorthwindCRUD/Services/CategoryService.cs b/NorthwindCRUD/Services/CategoryService.cs
index 67e8986..a5157fd 100644
--- a/NorthwindCRUD/Services/CategoryService.cs
+++ b/NorthwindCRUD/Services/CategoryService.cs
@@ -48,9 +48,9 @@ public CategoryDb Create(CategoryDb model)
             return categoryEntity.Entity;
         }
 
-        public CategoryDb? Update(CategoryDb model)
+        public CategoryDb? Update(int id, CategoryDb model)
         {
-            var categoryEntity = this.dataContext.Categories.FirstOrDefault(c => c.CategoryId == model.CategoryId);
+            var categoryEntity = this.dataContext.Categories.FirstOrDefault(c => c.CategoryId == id);
             if (categoryEntity != null)
             {
                 categoryEntity.Description = model.Description != null ? model.Description : categoryEntity.Description;
diff --git a/NorthwindCRUD/Services/CustomerService.cs b/NorthwindCRUD/Services/CustomerService.cs
index c2e6a1b..e3493bc 100644
--- a/NorthwindCRUD/Services/CustomerService.cs
+++ b/NorthwindCRUD/Services/CustomerService.cs
@@ -73,11 +73,11 @@ public CustomerDb Create(CustomerDb model)
             return customerEntity.Entity;
         }
 
-        public CustomerDb? Update(CustomerDb model)
+        public CustomerDb? Update(string id, CustomerDb model)
         {
             var customerEntity = this.dataContext.Customers
                 .Include(c => c.Address)
-                .FirstOrDefault(c => c.CustomerId == model.CustomerId);
+                .FirstOrDefault(c => c.CustomerId == id);
 
             if (customerEntity != null)
             {
diff --git a/NorthwindCRUD/Services/EmployeeService.cs b/NorthwindCRUD/Services/EmployeeService.cs
index 722cef5..0151c79 100644
--- a/NorthwindCRUD/Services/EmployeeService.cs
+++ b/NorthwindCRUD/Services/EmployeeService.cs
@@ -70,11 +70,11 @@ public EmployeeDb Create(EmployeeDb model)
             return employeeEntity.Entity;
         }
 
-        public EmployeeDb? Update(EmployeeDb model)
+        public EmployeeDb? Update(int id, EmployeeDb model)
         {
             var employeeEntity = this.dataContext.Employees
                 .Include(c => c.Address)
-                .FirstOrDefault(e => e.EmployeeId == model.EmployeeId);
+                .FirstOrDefault(e => e.EmployeeId == id);
 
             if (employeeEntity != null)
             {
diff --git a/NorthwindCRUD/Services/OrderService.cs b/NorthwindCRUD/Services/OrderService.cs
index ae29119..0732741 100644
--- a/NorthwindCRUD/Services/OrderService.cs
+++ b/NorthwindCRUD/Services/OrderService.cs
@@ -128,7 +128,7 @@ public OrderDb Create(OrderDb model)
             return orderEntity.Entity;
         }
 
-        public OrderDb? Update(OrderDb model)
+        public OrderDb? Update(int id, OrderDb model)
         {
             if (this.dataContext.Customers.FirstOrDefault(c => c.CustomerId == model.CustomerId) == null)
             {
@@ -147,7 +147,7 @@ public OrderDb Create(OrderDb model)
 
             var orderEntity = this.dataContext.Orders
                 .Include(c => c.ShipAddress)
-                .FirstOrDefault(e => e.OrderId == model.OrderId);
+                .FirstOrDefault(e => e.OrderId == id);
 
             if (orderEntity != null)
             {
diff --git a/NorthwindCRUD/Services/ProductService.cs b/NorthwindCRUD/Services/ProductService.cs
index 32089bb..f0bf74f 100644
--- a/NorthwindCRUD/Services/ProductService.cs
+++ b/NorthwindCRUD/Services/ProductService.cs
@@ -76,7 +76,7 @@ public ProductDb Create(ProductDb model)
             return productEntity.Entity;
         }
 
-        public ProductDb? Update(ProductDb model)
+        public ProductDb? Update(int id, ProductDb model)
         {
             if (this.dataContext.Categories.FirstOrDefault(c => c.CategoryId == model.CategoryId) == null)
             {
@@ -88,7 +88,7 @@ public ProductDb Create(ProductDb model)
                 throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, StringTemplates.InvalidEntityMessage, nameof(model.Supplier), model.SupplierId?.ToString(CultureInfo.InvariantCulture)));
             }
 
-            var productEntity = this.dataContext.Products.FirstOrDefault(p => p.ProductId == model.ProductId);
+            var productEntity = this.dataContext.Products.FirstOrDefault(p => p.ProductId == id);
             if (productEntity != null)
             {
                 productEntity.SupplierId = model.SupplierId != null ? model.SupplierId : productEntity.SupplierId;
diff --git a/NorthwindCRUD/Services/RegionService.cs b/NorthwindCRUD/Services/RegionService.cs
index 2f5d6d7..ce0bfbc 100644
--- a/NorthwindCRUD/Services/RegionService.cs
+++ b/NorthwindCRUD/Services/RegionService.cs
@@ -47,9 +47,9 @@ public RegionDb Create(RegionDb model)
             return regionEntity.Entity;
         }
 
-        public RegionDb? Update(RegionDb model)
+        public RegionDb? Update(int id, RegionDb model)
         {
-            var regionEntity = this.dataContext.Regions.FirstOrDefault(p => p.RegionId == model.RegionId);
+            var regionEntity = this.dataContext.Regions.FirstOrDefault(p => p.RegionId == id);
             if (regionEntity != null)
             {
                 regionEntity.RegionDescription = model.RegionDescription != null ? model.RegionDescription : regionEntity.RegionDescription;
diff --git a/NorthwindCRUD/Services/ShipperService.cs b/NorthwindCRUD/Services/ShipperService.cs
index b9143f2..3243a37 100644
--- a/NorthwindCRUD/Services/ShipperService.cs
+++ b/NorthwindCRUD/Services/ShipperService.cs
@@ -47,9 +47,9 @@ public ShipperDb Create(ShipperDb model)
             return shipperEntity.Entity;
         }
 
-        public ShipperDb? Update(ShipperDb model)
+        public ShipperDb? Update(int id, ShipperDb model)
         {
-            var shipperEntity = this.dataContext.Shippers.FirstOrDefault(p => p.ShipperId == model.ShipperId);
+            var shipperEntity = this.dataContext.Shippers.FirstOrDefault(p => p.ShipperId == id);
             if (shipperEntity != null)
             {
                 shipperEntity.Phone = model.Phone != null ? model.Phone : shipperEntity.Phone;
diff --git a/NorthwindCRUD/Services/SupplierService.cs b/NorthwindCRUD/Services/SupplierService.cs
index e7a852e..197f34b 100644
--- a/NorthwindCRUD/Services/SupplierService.cs
+++ b/NorthwindCRUD/Services/SupplierService.cs
@@ -47,9 +47,9 @@ public SupplierDb Create(SupplierDb model)
             return supplierEntity.Entity;
         }
 
-        public SupplierDb? Update(SupplierDb model)
+        public SupplierDb? Update(int id, SupplierDb model)
         {
-            var supplierEntity = this.dataContext.Suppliers.FirstOrDefault(p => p.SupplierId == model.SupplierId);
+            var supplierEntity = this.dataContext.Suppliers.FirstOrDefault(p => p.SupplierId == id);
             if (supplierEntity != null)
             {
                 supplierEntity.Address = model.Address != null ? model.Address : supplierEntity.Address;
diff --git a/NorthwindCRUD/Services/TerritoryService.cs b/NorthwindCRUD/Services/TerritoryService.cs
index 5f5c799..6d2b197 100644
--- a/NorthwindCRUD/Services/TerritoryService.cs
+++ b/NorthwindCRUD/Services/TerritoryService.cs
@@ -59,14 +59,14 @@ public TerritoryDb Create(TerritoryDb model)
             return territoryEntity.Entity;
         }
 
-        public TerritoryDb? Update(TerritoryDb model)
+        public TerritoryDb? Update(string id, TerritoryDb model)
         {
             if (this.dataContext.Regions.FirstOrDefault(r => r.RegionId == model.RegionId) == null)
             {
                 throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, StringTemplates.InvalidEntityMessage, nameof(model.Region), model.RegionId?.ToString(CultureInfo.InvariantCulture)));
             }
 
-            var territoryEntity = this.dataContext.Territories.FirstOrDefault(p => p.TerritoryId == model.TerritoryId);
+            var territoryEntity = this.dataContext.Territories.FirstOrDefault(p => p.TerritoryId == id);
             if (territoryEntity != null)
             {
                 territoryEntity.TerritoryDescription = model.TerritoryDescription != null ? model.TerritoryDescription : territoryEntity.TerritoryDescription;